Prof. Minoru Obara Profile

Prof. Minoru Obara

Director at Keio Univ

SPIE Involvement:

Author

Publications (135)

Proceedings Article | 10 March 2012 Paper

Effects of polarization in low-level laser therapy of spinal cord injury in rats

Takahiro Ando, Shunichi Sato, Hiroaki Kobayashi, Hiroshi Nawashiro, Hiroshi Ashida, Michael Hamblin, Minoru Obara

Proceedings Volume 8211, 82110B (2012) https://doi.org/10.1117/12.906951

KEYWORDS: Polarization, Spinal cord, Injuries, Acquisition tracking and pointing, Tissue optics, Laser irradiation, Laser therapeutics, Laser tissue interaction, Tissues, Photons

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Proceedings Article | 23 February 2012 Paper

Theoretical analysis of the modal behavior of 2D random photonic crystals

Shimpei Hamada, Seiji Takeda, Pierre Viktorovitch, Minoru Obara

Proceedings Volume 8269, 826924 (2012) https://doi.org/10.1117/12.906960

KEYWORDS: Photonic crystals, Finite-difference time-domain method, Crystals, Multiple scattering, Quality systems, Silicon, Received signal strength, Dispersion, Light scattering, Scattering

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Proceedings Article | 13 February 2012 Paper

Enhanced near-field properties of a gap of TiO2 nanosphere pairs for 3D photocatalytic optical trap

Toshiyuki Honda, Mitsuhiro Terakawa, Minoru Obara

Proceedings Volume 8274, 82740Z (2012) https://doi.org/10.1117/12.907207

KEYWORDS: Near field optics, Near field, Optical spheres, Optical tweezers, Nanostructures, Silica, Gold, Photocatalysis, Finite-difference time-domain method, Titanium dioxide

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SPIE Journal Paper | 1 October 2011 Open Access

Site-specific gene transfer into the rat spinal cord by photomechanical waves

Takahiro Ando, Minoru Obara, Shunichi Sato, Hiroshi Ashida, Terushige Toyooka, Yoichi Uozumi, Hiroshi Nawashiro

JBO, Vol. 16, Issue 10, 108002, (October 2011) https://doi.org/10.1117/12.10.1117/1.3642014

KEYWORDS: Spinal cord, Tissues, Injuries, Laser irradiation, Pulsed laser operation, Luminescence, Glia, Defense and security, Natural surfaces, Laser tissue interaction

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SPIE Journal Paper | 1 September 2011 Open Access

Targeted gene transfer into rat facial muscles by nanosecond pulsed laser-induced stress waves

Akihiro Kurita, Takeshi Matsunobu, Akinori Shiotani, Yasushi Satoh, Takahiro Ando, Shunichi Sato, Minoru Obara

JBO, Vol. 16, Issue 09, 098002, (September 2011) https://doi.org/10.1117/12.10.1117/1.3628313

KEYWORDS: Tissues, Pulsed laser operation, Skin, Nerve, Laser tissue interaction, Laser therapeutics, Nerve regeneration, Nd:YAG lasers, Defense and security, Ultrasonography

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Proceedings Article | 1 March 2011 Paper

Theoretical analysis of the order to disorder phase transition in random photonic crystals

Shimpei Hamada, Seiji Takeda, Pierre Viktorovitch, Mitsuhiro Terakawa, Minoru Obara

Proceedings Volume 7946, 79460J (2011) https://doi.org/10.1117/12.873483

KEYWORDS: Photonic crystals, Crystals, Finite-difference time-domain method, Multiple scattering, Dispersion, Nanostructures, Silicon, Received signal strength, Radio propagation, Wave propagation

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Proceedings Article | 1 March 2011 Paper

Surface emitting laser based on random photonic crystals

Seiji Takeda, Shimpei Hamada, Romain Peretti, Christian Seassal, Xavier Letartre, Pierre Viktorovitch, Minoru Obara

Proceedings Volume 7946, 794607 (2011) https://doi.org/10.1117/12.874233

KEYWORDS: Photonic crystals, Near field scanning optical microscopy, Light scattering, Laser crystals, Scattering, Finite-difference time-domain method, Multiple scattering, Near field optics, Photons, Near field

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Proceedings Article | 18 February 2011 Paper

Efficient delivery of small interfering RNA into injured spinal cords in rats by photomechanical waves

Takahiro Ando, Shunichi Sato, Terushige Toyooka, Hiroaki Kobayashi, Hiroshi Nawashiro, Hiroshi Ashida, Minoru Obara

Proceedings Volume 7883, 78834S (2011) https://doi.org/10.1117/12.873513

KEYWORDS: Spinal cord, Tissues, Proteins, Injuries, Luminescence, Defense and security, In vivo imaging, Medical research, Pulsed laser operation, Nervous system

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Proceedings Article | 16 November 2010 Paper

Mode control of random microresonators consisting of scattering particles

S. Takeda, S. Hamada, M. Terakawa, T. Saiki, M. Obara

Proceedings Volume 7751, 77511A (2010) https://doi.org/10.1117/12.880941

KEYWORDS: Scattering, Particles, Laser scattering, Light scattering, Refractive index, Finite-difference time-domain method, Laser resonators, Random lasers, Microresonators, Maxwell's equations

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Proceedings Article | 16 November 2010 Paper

Efficient femtosecond laser surface patterning using high dielectric constant particles with small size parameter

Minoru Obara, Yuto Tanaka, Go Obara, Akira Zenidaka, Mitsuhiro Terakawa

Proceedings Volume 7751, 77511V (2010) https://doi.org/10.1117/12.881321

KEYWORDS: Particles, Near field, Dielectrics, Refractive index, Gold, Silicon, Silica, Femtosecond phenomena, Mie scattering, Glasses

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Proceedings Article | 16 November 2010 Paper

Directionally controlled plasmon excitation in gold nanoparticles for near-field nanopatterning by femtosecond laser

Tomoya Miyanishi, Mitsuhiro Terakawa, Minoru Obara, Nikolay Nedyalkov, Petar Atanasov

Proceedings Volume 7751, 77511X (2010) https://doi.org/10.1117/12.880738

KEYWORDS: Particles, Gold, Nanoparticles, Plasmons, Silicon, Near field, Nanolithography, Femtosecond phenomena, Finite-difference time-domain method, Near field optics

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Proceedings Article | 16 November 2010 Paper

Nano-surface patterning by femtosecond laser for plasmonic surface optical applications

Go Obara, Tomoya Miyanishi, Yuto Tanaka, Mitsuhiro Terakawa, Minoru Obara

Proceedings Volume 7751, 77511Y (2010) https://doi.org/10.1117/12.881486

KEYWORDS: Particles, Near field optics, Gold, Silicon, Nanoparticles, Near field, Plasmonics, Femtosecond phenomena, Nanostructures, Optical lithography

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Proceedings Article | 5 March 2010 Paper

In vivo photodynamic inactivation of Psuedomonas aeruginosa in burned skin in rats

Akihiro Hirao, Shunichi Sato, Mitsuhiro Terakawa, Daizoh Saitoh, Nariyoshi Shinomiya, Hiroshi Ashida, Minoru Obara

Proceedings Volume 7551, 75510V (2010) https://doi.org/10.1117/12.841495

KEYWORDS: Photodynamic therapy, Bacteria, Skin, Picosecond phenomena, Tissues, In vivo imaging, Tissue optics, Defense and security, Natural surfaces, Medical research

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Proceedings Article | 24 February 2010 Paper

Photoacoustic diagnosis of edema in rat burned skin

Ken Yoshida, Shunichi Sato, Kosuke Hatanaka, Daizoh Saitoh, Hiroshi Ashida, Toshihisa Sakamoto, Minoru Obara

Proceedings Volume 7564, 75641C (2010) https://doi.org/10.1117/12.841438

KEYWORDS: Tissues, Skin, Photoacoustic spectroscopy, Injuries, Absorption, Blood vessels, Signal detection, Defense and security, Tissue optics, Natural surfaces

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Proceedings Article | 23 February 2010 Paper

Effects of laser parameters on propagation characteristics of laser-induced stress wave for gene transfer

Takahiro Ando, Shunichi Sato, Mitsuhiro Terakawa, Hiroshi Ashida, Minoru Obara

Proceedings Volume 7562, 75620Y (2010) https://doi.org/10.1117/12.840815

KEYWORDS: Skin, Tissues, Wave propagation, Laser tissue interaction, Laser therapeutics, Pulsed laser operation, Laser energy, In vivo imaging, Nervous system, Plasma

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Proceedings Article | 15 February 2010 Paper

Post-annealing of p-type ZnO:Sb thin film grown by pulsed laser deposition

Y. Yata, T. Sakano, M. Obara

Proceedings Volume 7603, 76031R (2010) https://doi.org/10.1117/12.840973

KEYWORDS: Thin films, Zinc oxide, Antimony, Thin film growth, Temperature metrology, Annealing, Gallium nitride, Zinc, Pulsed laser deposition, Chemical elements

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SPIE Journal Paper | 1 November 2009 Open Access

Accelerated adhesion of grafted skin by laser-induced stress wave-based gene transfer of hepatocyte growth factor

Kazuya Aizawa, Shunichi Sato, Mitsuhiro Terakawa, Daizoh Saitoh, Hitoshi Tsuda, Hiroshi Ashida, Minoru Obara

JBO, Vol. 14, Issue 06, 064043, (November 2009) https://doi.org/10.1117/12.10.1117/1.3253325

KEYWORDS: Skin, Tissues, Transplantation, Wound healing, Blood circulation, Doppler effect, Proteins, Defense and security, Laser tissue interaction, Imaging systems

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Proceedings Article | 19 February 2009 Paper

Accelerated adhesion of grafted skins by laser-induced stress wave-based gene transfer of hepatocyte growth factor

Kazuya Aizawa, Shunichi Sato, Daizoh Saitoh, Hitoshi Tsuda, Hiroshi Ashida, Minoru Obara

Proceedings Volume 7161, 71610L (2009) https://doi.org/10.1117/12.808663

KEYWORDS: Skin, Transplantation, Tissues, Blood circulation, Doppler effect, Wound healing, Defense and security, Plasma, Blood, Pulsed laser operation

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Proceedings Article | 12 February 2009 Paper

In vivo photoacoustic monitoring of photosensitizer in skin: application to dosimetry for antibacterial photodynamic treatment

Akihiro Hirao, Shunichi Sato, Daizoh Saitoh, Nariyoshi Shinomiya, Hiroshi Ashida, Minoru Obara

Proceedings Volume 7177, 71772C (2009) https://doi.org/10.1117/12.808480

KEYWORDS: Sodium, Skin, Tissue optics, Photoacoustic spectroscopy, Blood, In vivo imaging, Tissues, Signal attenuation, Signal detection, Acoustics

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Proceedings Article | 19 December 2008 Paper

Nanostructure processing by near-field with femtosecond laser excitation: process switching and SERS application

Minoru Obara, Tatsunori Sakano, Tetsuo Sakai, Henry Nugroho, Tomoya Miyanishi, Yuto Tanaka, Toshiharu Saiki, Nikolay Nedyalkov, Petar Atanasov

Proceedings Volume 7027, 702703 (2008) https://doi.org/10.1117/12.822436

KEYWORDS: Particles, Zinc oxide, Silicon, Gold, Picosecond phenomena, Dielectrics, Glasses, Metals, Nanolithography, Nanorods

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Proceedings Article | 19 December 2008 Paper

Pulsed-laser deposition of ZnO thin films and nanorods for photonic devices

Tatsunori Sakano, Ryo Nishimura, Hiroki Fukuoka, Yoshihiro Yata, Toshiharu Saiki, Minoru Obara

Proceedings Volume 7027, 70270A (2008) https://doi.org/10.1117/12.822447

KEYWORDS: Zinc oxide, Gallium nitride, Thin films, Protactinium, Argon, Atomic force microscopy, Luminescence, Annealing, Sapphire, Nanorods

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Proceedings Article | 19 December 2008 Paper

Formation and initial evolution of nanoparticles at ultrashort laser ablation of gold: molecular dynamics simulation

N. N. Nedyalkov, S. Imamova, P. A. Atanasov, M. Obara

Proceedings Volume 7027, 702709 (2008) https://doi.org/10.1117/12.822446

KEYWORDS: Laser ablation, Nanoparticles, Picosecond phenomena, Pulsed laser operation, Gold, Particles, Liquids, Thermodynamics, Optical simulations, Molecular lasers

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SPIE Journal Paper | 1 November 2008 Open Access

Photoacoustic monitoring of burn healing process in rats

Kazuya Aizawa, Shunichi Sato, Daizoh Saitoh, Hiroshi Ashida, Minoru Obara

JBO, Vol. 13, Issue 06, 064020, (November 2008) https://doi.org/10.1117/12.10.1117/1.3028005

KEYWORDS: Tissues, Blood, Photoacoustic spectroscopy, Skin, Wound healing, Hemodynamics, Injuries, Signal processing, Blood vessels, Oxygen

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Proceedings Article | 12 May 2008 Paper

ZnO thin film and nanorod growth by pulsed laser deposition for photonic devices

Tatsunori Sakano, Ryo Nishimura, Hiroki Fukuoka, Yoshihiro Yata, Toshiharu Saiki, Minoru Obara, Hiroyuki Kato, Michihiro Sano

Proceedings Volume 7005, 70051B (2008) https://doi.org/10.1117/12.785224

KEYWORDS: Zinc oxide, Gallium nitride, Protactinium, Argon, Oxygen, Thin films, Annealing, Atomic force microscopy, Zinc, Nanorods

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Proceedings Article | 28 February 2008 Paper

Monitoring of healing process of burns based on multiwavelength photoacoustic measurement

Kazuya Aizawa, Shunichi Sato, Daizoh Saitoh, Hiroshi Ashida, Minoru Obara

Proceedings Volume 6856, 685605 (2008) https://doi.org/10.1117/12.764247

KEYWORDS: Photoacoustic spectroscopy, Injuries, Tissues, Absorption, Wound healing, Blood, Skin, Oxygen, Hemodynamics, Defense and security

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SPIE Journal Paper | 1 May 2007 Open Access

Enhanced angiogenesis in grafted skins by laser-induced stress wave-assisted gene transfer of hepatocyte growth factor

Mitsuhiro Terakawa, Shunichi Sato, Daizoh Saitoh, Hitoshi Tsuda, Hiroshi Ashida, Hirofumi Okano, Minoru Obara

JBO, Vol. 12, Issue 03, 034031, (May 2007) https://doi.org/10.1117/12.10.1117/1.2745313

KEYWORDS: Skin, Tissues, Transplantation, In vivo imaging, Blood vessels, Defense and security, Laser therapeutics, Medicine, Medical research, Proteins

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Proceedings Article | 13 March 2007 Paper

Fabrication and characterization of ZnO nanorods by pulsed laser deposition method through catalyst-free process

Ryo Nishimura, Tatsunori Sakano, Takeshi Okato, Minoru Obara

Proceedings Volume 6458, 645817 (2007) https://doi.org/10.1117/12.706278

KEYWORDS: Zinc oxide, Nanolithography, Silicon, Annealing, Zinc, Pulsed laser deposition, Gas sensors, Nanostructures, Silicates, Nanorods

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Proceedings Article | 19 February 2007 Paper

Enhanced angiogenesis in grafted skins by gene transfer of human hepatocyte growth factor using laser-induced stress waves

Mitsuhiro Terakawa, Shunichi Sato, Daizoh Saitoh, Hitoshi Tsuda, Hiroshi Ashida, Hideyuki Okano, Minoru Obara

Proceedings Volume 6435, 643513 (2007) https://doi.org/10.1117/12.700215

KEYWORDS: Skin, Laser therapeutics, Transplantation, Defense and security, Blood vessels, Medical research, Medicine, Oxygen, Tissues, Laser tissue interaction

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Proceedings Article | 14 February 2007 Paper

Mode selectivity of random lasing in one-dimensional model

Seiji Takeda, Minoru Obara

Proceedings Volume 6452, 645217 (2007) https://doi.org/10.1117/12.698544

KEYWORDS: Reflectivity, Light scattering, Scattering, Random lasers, Photons, Spectroscopy, Refractive index, Laser systems engineering, Atmospheric particles, Laser scattering

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Proceedings Article | 6 February 2007 Paper

Laser-induced stress wave-assisted gene transfection: improved transfection efficiency with cationic liposome-modified plasmid DNA

Risa Otsuka, Mitsuhiro Terakawa, Shunichi Sato, Yasushi Satoh, Kunio Takishima, Hiroshi Ashida, Minoru Obara

Proceedings Volume 6435, 643518 (2007) https://doi.org/10.1117/12.701734

KEYWORDS: Luminescence, In vitro testing, Green fluorescent protein, Microscopes, Tissue optics, Polymers, Defense and security, Solids, Pulsed laser operation, Q switched lasers

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Proceedings Article | 7 June 2006 Paper

Gene transfer of human hepatocyte growth factor by the use of nanosecond pulsed laser-induced stress waves

Mitsuhiro Terakawa, Shunichi Sato, Daizoh Saitoh, Makoto Hasegawa, Hiroshi Ashida, Hideyuki Okano, Minoru Obara

Proceedings Volume 6261, 626133 (2006) https://doi.org/10.1117/12.668965

KEYWORDS: Skin, Proteins, Pulsed laser operation, In vivo imaging, Q switched lasers, Laser therapeutics, Defense and security, Medical research, Nd:YAG lasers, High power lasers

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Proceedings Article | 7 June 2006 Paper

Nanoprocessing of silicon substrate using surface plasmon polaritons of gold particle and polystyrene particle excited by femtosecond laser

Tomoya Miyanishi, Hiroto Takada, Nikolay Nedyalkov, Makoto Hasegawa, Minoru Obara

Proceedings Volume 6261, 62612S (2006) https://doi.org/10.1117/12.674501

KEYWORDS: Particles, Gold, Silicon, Femtosecond phenomena, Nanolithography, Finite-difference time-domain method, Surface plasmon polaritons, Scanning electron microscopy, Semiconductor lasers, Laser ablation

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Proceedings Article | 6 March 2006 Paper

Efficacy of photodynamic inactivation against Pseudomonas aeruginosa with pulsed light and CW light excitation

Tohru Yamaguchi, Shunichi Sato, Satoko Kawauchi, Mitsuhiro Terakawa, Nariyoshi Shinomiya, Daizoh Saitoh, Hiroshi Ashida, Minoru Obara

Proceedings Volume 6139, 61390V (2006) https://doi.org/10.1117/12.653078

KEYWORDS: Absorption, Tissue optics, Skin, Signal attenuation, Photodynamic therapy, Molecules, Transmittance, Bacteria, Oxygen

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Proceedings Article | 1 March 2006 Paper

Nitrogen-doped TiO₂ thin films grown on various substrates

Tatsunori Sakano, Takeshi Okato, Minoru Obara

Proceedings Volume 6106, 610615 (2006) https://doi.org/10.1117/12.645433

KEYWORDS: Sapphire, Glasses, Crystals, Raman spectroscopy, Absorption, Thin films, Visible radiation, Thin film growth, Nitrogen, Doping

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Proceedings Article | 28 February 2006 Paper

Femtosecond laser processing of subwavelength-sized voids for compact optical devices

Eiji Toratani, Masanao Kamata, Nikolay Nedyalkov, Minoru Obara

Proceedings Volume 6108, 610815 (2006) https://doi.org/10.1117/12.644014

KEYWORDS: Waveguides, Silica, Femtosecond phenomena, Optical components, Refractive index, Objectives, Reflectors, Fabrication, Microscopes, Scanning electron microscopy

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Proceedings Article | 22 February 2006 Paper

Targeted gene transfer of human hepatocyte growth factor into rat skin by the use of laser-induced stress waves

Mitsuhiro Terakawa, Shunichi Sato, Daizoh Saitoh, Hiroshi Ashida, Hideyuki Okano, Minoru Obara

Proceedings Volume 6078, 60780T (2006) https://doi.org/10.1117/12.645473

KEYWORDS: Skin, Proteins, Laser therapeutics, In vivo imaging, Defense and security, Medicine, Energy efficiency, Laser tissue interaction, Laser bonding, Electronics

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SPIE Journal Paper | 1 January 2006 Open Access

In vitro gene transfer to mammalian cells by the use of laser-induced stress waves: effects of stress wave parameters, ambient temperature, and cell type

Mitsuhiro Terakawa, Shunichi Sato, Hiroshi Ashida, Kazuya Aizawa, Maki Uenoyama, Yoshinori Masaki, Minoru Obara

JBO, Vol. 11, Issue 01, 014026, (January 2006) https://doi.org/10.1117/12.10.1117/1.2160407

KEYWORDS: In vitro testing, Laser therapeutics, Plasma, Pulsed laser operation, Luminescence, Tissues, Laser energy, In vivo imaging, Temperature metrology, Glasses

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Proceedings Article | 9 November 2005 Paper

CW DUV light sources for inspection tools

Jun Sakuma, Yasuyuki Okada, Tetsumi Sumiyoshi, Hitoshi Sekita, Minoru Obara

Proceedings Volume 5992, 599243 (2005) https://doi.org/10.1117/12.632101

KEYWORDS: Deep ultraviolet, Atomic force microscopy, Crystals, Continuous wave operation, Light sources, Nonlinear crystals, Second-harmonic generation, Inspection, Fiber lasers

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SPIE Journal Paper | 1 November 2005 Open Access

Targeted DNA transfection into the mouse central nervous system using laser-induced stress waves

Yasushi Sato, Kunio Takishima, Yasunari Kanda, Katsushige Mizuno, Yasuhiro Watanabe, Mitsuhiro Terakawa, Minoru Obara, Shogo Endo, Hidetoshi Ooigawa, Hiroshi Nawashiro, Shunichi Sato

JBO, Vol. 10, Issue 06, 060501, (November 2005) https://doi.org/10.1117/12.10.1117/1.2128432

KEYWORDS: Brain, Tissues, Nervous system, Defense and security, Luminescence, Pulsed laser operation, Natural surfaces, Biochemistry, Pharmacology, Neuroscience

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SPIE Journal Paper | 1 November 2005 Open Access

Transcranial measurement of diffuse light reflectance from cold-injured brains in rats

Yoshinori Ueda, Shunichi Sato, Hiroshi Ashida, Hidetoshi Ooigawa, Hiroshi Nawashiro, Katsuji Shima, Daizoh Saitoh, Yoshiaki Okada, Minoru Obara

JBO, Vol. 10, Issue 06, 064010, (November 2005) https://doi.org/10.1117/12.10.1117/1.2136386

KEYWORDS: Brain, Reflectivity, Injuries, Tissue optics, Tissues, Optical testing, Light scattering, Blood, Scattering, Blood circulation

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SPIE Journal Paper | 1 November 2005 Open Access

Measurement of burn depths in rats using multiwavelength photoacoustic depth profiling

Mutsuo Yamazaki, Shunichi Sato, Hiroshi Ashida, Daizo Saito, Yoshiaki Okada, Minoru Obara

JBO, Vol. 10, Issue 06, 064011, (November 2005) https://doi.org/10.1117/12.10.1117/1.2137287

KEYWORDS: Skin, Tissues, Blood, Absorption, Tissue optics, Photoacoustic spectroscopy, Sensors, Blood vessels, Profiling, Injuries

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Proceedings Article | 27 August 2005 Paper

Antimicrobial photodynamic treatment of gram-negative bacteria with a cationic phenothiazine dye under pulsed light irradiation

Satoko Kawauchi, Shunichi Sato, Toru Yamaguchi, Nariyoshi Shinomiya, Daizo Saito, Hiroshi Ashida, Minoru Obara, Makoto Kikuchi

Proceedings Volume 5863, 58630W (2005) https://doi.org/10.1117/12.633093

KEYWORDS: Bacteria, Picosecond phenomena, Defense and security, Oxygen, In vitro testing, Photoacoustic spectroscopy, Biomedical optics, Lung cancer, Photodynamic therapy

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Proceedings Article | 27 August 2005 Paper

Gene transfer by the use of laser-induced stress wave: cell type dependence of transfection efficiency

Mitsuhiro Terakawa, Shunichi Sato, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5863, 58630E (2005) https://doi.org/10.1117/12.633104

KEYWORDS: Laser tissue interaction, Luminescence, Electronics, Electrical engineering, Biomedical optics, Ovary, Q switched lasers, Defense and security, Medical research, Safety

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Proceedings Article | 25 April 2005 Paper

Transcranial measurement of diffuse light reflectance from brain edema in rats: effect of change in the blood flow

Yoshinori Ueda, Shunichi Sato, Hidetoshi Ooigawa, Hiroshi Nawashiro, Daizoh Saitoh, Katsuji Shima, Yoshiaki Okada, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5686, (2005) https://doi.org/10.1117/12.590008

KEYWORDS: Brain, Injuries, Reflectivity, Diffuse reflectance spectroscopy, Blood, Blood circulation, Scattering, Optical testing, Absorption, Light scattering

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Proceedings Article | 25 April 2005 Paper

Photoacoustic detection of neovascularities in skin graft

Mutsuo Yamazaki, Shunichi Sato, Daizo Saitoh, Miya Ishihara, Yoshiaki Okada, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5686, (2005) https://doi.org/10.1117/12.588879

KEYWORDS: Skin, Photoacoustic spectroscopy, Signal detection, Transplantation, Tissues, Transducers, Defense and security, Blood circulation, Chromophores, Blood

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Proceedings Article | 22 April 2005 Paper

Surface subwavelength structure and photonic device fabrication with temporally tailored multiple femtosecond laser pulses

Minoru Obara, Hiroto Takada, Tetsuya Nagata, Masanao Kamata

Proceedings Volume 5830, (2005) https://doi.org/10.1117/12.617180

KEYWORDS: Particles, Femtosecond phenomena, Silicon, Waveguides, Laser ablation, Silica, Nanolithography, Picosecond phenomena, Near field optics, Refractive index

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Proceedings Article | 22 April 2005 Paper

Fabrication of Nd:KGW waveguides by use of nozzle-gas-assisted PLD method

Takeshi Okato, Minoru Obara, Petar Atanasov

Proceedings Volume 5830, (2005) https://doi.org/10.1117/12.617356

KEYWORDS: Crystals, Oxygen, Thin films, Absorption, Sapphire, Annealing, Waveguides, Scanning electron microscopy, Argon, Laser ablation

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Proceedings Article | 15 April 2005 Paper

In vitro gene transfer by the use of laser-induced stress wave: effect of laser irradiation conditions on transfection efficiency

Mitsuhiro Terakawa, Shunichi Sato, Makoto Ogura, Yoshinori Masaki, Maki Uenoyama, Hitoshi Wakisaka, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5695, (2005) https://doi.org/10.1117/12.588852

KEYWORDS: In vitro testing, Laser therapeutics, Laser irradiation, Plasma, Laser energy, Laser tissue interaction, In vivo imaging, Pulsed laser operation, Defense and security, Medical research

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Proceedings Article | 12 April 2005 Paper

Fabrication and characterization of hexagonally assembled ZnO and ZnO:N thin films with buffer layer by pulsed-laser deposition

Takenori Osada, Takeshi Okato, Minoru Obara

Proceedings Volume 5713, (2005) https://doi.org/10.1117/12.589534

KEYWORDS: Zinc oxide, Thin films, Nitrogen, Crystals, Annealing, Sapphire, Nanolithography, Epitaxial lateral overgrowth, Gallium nitride, Atomic force microscopy

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Proceedings Article | 12 April 2005 Paper

Laser ablation of TiO_2-2xN_x targets for efficient N-doping into anatase TiO₂ photocatalytic films

Tatsunori Sakano, Takeshi Okato, Minoru Obara

Proceedings Volume 5713, (2005) https://doi.org/10.1117/12.591362

KEYWORDS: Nitrogen, Doping, Crystals, Visible radiation, Laser ablation, Particles, Thin films, Epitaxy, Tin, Oxidation

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Proceedings Article | 12 April 2005 Paper

Two-dimensional hexagonally arrayed nanohole fabrication on silicon substrate using a femtosecond laser pulse

Hiroto Takada, Minoru Obara

Proceedings Volume 5713, (2005) https://doi.org/10.1117/12.589985

KEYWORDS: Particles, Silicon, Nanolithography, Atomic force microscopy, Femtosecond phenomena, Finite-difference time-domain method, Scanning electron microscopy, Laser ablation, Pulsed laser operation, Nanoparticles

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Proceedings Article | 12 April 2005 Paper

Nitrogen-doped ZnO thin films by use of laser ablation of ZnO(1-x)Nx targets

Takeshi Okato, Takenori Osada, Minoru Obara

Proceedings Volume 5713, (2005) https://doi.org/10.1117/12.591336

KEYWORDS: Zinc oxide, Nitrogen, Thin films, Sapphire, Crystals, Laser ablation, X-ray diffraction, Doping, Gallium nitride, N-type semiconductors

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Proceedings Article | 8 April 2005 Paper

Pulsed photodynamic inactivation of gram-negative bacteria: electron microscopic study

Masafumi Nagasawa, Shunichi Sato, Satoko Kawauchi, Nariyoshi Shinomiya, Daizo Saito, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5689, (2005) https://doi.org/10.1117/12.589993

KEYWORDS: Bacteria, Photodynamic therapy, Transmission electron microscopy, Photomicroscopy, Scanning electron microscopy, Defense and security, Electron microscopy, Luminescence, In vitro testing, Resistance

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Proceedings Article | 21 March 2005 Paper

Ablation processing of biomedical materials with femtosecond double-pulse lasers through hollow fibers

Yoshihiro Hagiwara, Akihito Hongo, Minoru Obara

Proceedings Volume 5714, (2005) https://doi.org/10.1117/12.589972

KEYWORDS: Laser ablation, Picosecond phenomena, Femtosecond phenomena, Biomedical optics, Ultrafast phenomena, Pulsed laser operation, Fiber lasers, Materials processing, Tissues, Laser processing

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Proceedings Article | 21 March 2005 Paper

Molecular dynamics simulation of heat-affected zone of copper metal ablated with femtosecond laser

Yoichi Hirayama, Minoru Obara

Proceedings Volume 5714, (2005) https://doi.org/10.1117/12.589513

KEYWORDS: Laser ablation, Femtosecond phenomena, Copper, Optical simulations, Metals, Crystals, Etching, Molecular lasers, Laser crystals, Diffusion

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Proceedings Article | 20 September 2004 Paper

Nanostructure fabrication by femtosecond laser with near-field optical enhancement effect

Hiroto Takada, Masanao Kamata, Yoshihiro Hagiwara, Minoru Obara

Proceedings Volume 5448, (2004) https://doi.org/10.1117/12.546828

KEYWORDS: Particles, Silicon, Laser ablation, Near field optics, Femtosecond phenomena, Pulsed laser operation, Nanolithography, Scanning electron microscopy, Nanostructures, Laser irradiation

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Proceedings Article | 20 September 2004 Paper

Waveguide fabrication in transparent materials by use of temporally tailored multiple femtosecond pulses

Masanao Kamata, Tetsuya Nagata, Minoru Obara

Proceedings Volume 5448, (2004) https://doi.org/10.1117/12.546870

KEYWORDS: Femtosecond phenomena, Waveguides, Diffraction gratings, Refractive index, Picosecond phenomena, Helium neon lasers, Diffraction, Transmittance, Glasses, Microscopes

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Proceedings Article | 20 September 2004 Paper

Fabrication of low-loss Nd:KGW laser waveguide on silicon substrate

Takeshi Okato, Takenori Osada, Minoru Obara, Petar Atanasov, Rumen Tomov

Proceedings Volume 5448, (2004) https://doi.org/10.1117/12.546928

KEYWORDS: Waveguides, Silicon, Crystals, Refractive index, Waveguide lasers, Potassium, Thin films, Laser crystals, Ceramics, Pulsed laser deposition

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Proceedings Article | 20 September 2004 Paper

Optical waveguide fabrication with tailored femtosecond laser pulses

Tetsuya Nagata, Masanao Kamata, Minoru Obara

Proceedings Volume 5448, (2004) https://doi.org/10.1117/12.546886

KEYWORDS: Waveguides, Femtosecond phenomena, Silica, Picosecond phenomena, Refractive index, Glasses, Transmittance, Helium neon lasers, Fabrication, Laser ablation

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Proceedings Article | 15 July 2004 Paper

Laser cooling for Si atom manipulation with atomic mirror

Hiroshi Kumagai, S. Shimizu, T. Iwane, A. Kunieda, Katsumi Midorikawa, Minoru Obara

Proceedings Volume 5339, (2004) https://doi.org/10.1117/12.532842

KEYWORDS: Silicon, Semiconductor lasers, Chemical species, Mirrors, Light sources, Deep ultraviolet, Sapphire lasers, Atom manipulation, Continuous wave operation, Frequency conversion

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Proceedings Article | 13 July 2004 Paper

Measurement of backscattered light from the cold-injured brain: feasibility study of noninvasive monitoring of brain edema

Yoshinori Ueda, Shunichi Sato, Daizoh Saitoh, Hiroshi Nawashiro, Hidetoshi Ooigawa, Katsuji Shima, Yoshiaki Okada, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5312, (2004) https://doi.org/10.1117/12.533024

KEYWORDS: Brain, Injuries, Skull, Optical testing, Light scattering, Scattering, Tissue optics, Optical fibers, Helium neon lasers, Reflectivity

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Proceedings Article | 12 July 2004 Paper

Adhesion monitoring of skin grafts by photoacoustic measurement: experiment using rat allograft models

Mutsuo Yamazaki, Shunichi Sato, Daizo Saito, Yoshiaki Okada, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5320, (2004) https://doi.org/10.1117/12.530200

KEYWORDS: Skin, Photoacoustic spectroscopy, Tissues, Transducers, Visualization, Defense and security, Nd:YAG lasers, Signal detection, Electronics, Electrical engineering

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Proceedings Article | 1 July 2004 Paper

In vitro gene transfer by the application of laser-induced stress wave: effect of cellular heating

Mitsuhiro Terakawa, Shunichi Sato, Makoto Ogura, Kuniaki Nakanishi, Yoshinori Masaki, Maki Uenoyama, Hitoshi Wakisaka, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5322, (2004) https://doi.org/10.1117/12.530815

KEYWORDS: In vitro testing, Laser therapeutics, Plasma, Laser irradiation, Luminescence, Defense and security, Medical research, Green fluorescent protein, Pulsed laser operation, Sodium

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Proceedings Article | 14 June 2004 Paper

Pulsed photodynamic inactivation of gram-negative bacteria: in vitro study using methylene blue

Masafumi Nagasawa, Shunichi Sato, Satoko Kawauchi, Nariyoshi Shinomiya, Daizo Saito, Hiroshi Ashida, Minoru Obara

Proceedings Volume 5315, (2004) https://doi.org/10.1117/12.530817

KEYWORDS: Bacteria, Photodynamic therapy, In vitro testing, Defense and security, Cell death, Molecules, Biomedical optics, Optical parametric oscillators, Electronics, Electrical engineering

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Proceedings Article | 1 June 2004 Paper

Optical waveguide fabrication in new glasses and PMMA with temporally tailored ultrashort laser

Kousuke Ohta, Masanao Kamata, Minoru Obara, Naruhito Sawanobori

Proceedings Volume 5340, (2004) https://doi.org/10.1117/12.552849

KEYWORDS: Waveguides, Polymethylmethacrylate, Refractive index, Glasses, Fused quartz, Femtosecond phenomena, Ionization, Photography, Laser damage threshold, Absorption

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SPIE Journal Paper | 1 January 2004 Open Access

Assessment of expressions of heat shock protein (HSP 72) and apoptosis after ArF excimer laser ablation of the cornea

Miya Ishihara, Masato Sato, Shunichi Sato, Tsunenori Arai, Minoru Obara, Makoto Kikuchi

JBO, Vol. 9, Issue 01, (January 2004) https://doi.org/10.1117/12.10.1117/1.1630605

KEYWORDS: Laser ablation, Cell death, Excimer lasers, Temperature metrology, Cornea, Proteins, Laser optics, Tissues, Defense and security, Monoclonal antibodies

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Proceedings Article | 4 November 2003 Paper

Ablation processing of advanced materials by tailored femtosecond laser pulse

Minoru Obara, Peter Atanasov

Proceedings Volume 5226, (2003) https://doi.org/10.1117/12.519508

KEYWORDS: Laser ablation, Femtosecond phenomena, Etching, Gallium nitride, Waveguides, Sapphire lasers, Picosecond phenomena, Silica, Laser processing, Pulsed laser operation

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Proceedings Article | 17 October 2003 Paper

Femtosecond laser ablation processing of x-cut LiNbO3 substrates for optical communication devices

Riichi Kitano, Kazue Ozono, Minoru Obara, Hiroyuki Tsuda

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.479245

KEYWORDS: Laser ablation, Femtosecond phenomena, Objectives, Laser processing, Scanning electron microscopy, Optical components, Etching, Optical communications, Optical filters, Profilometers

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Proceedings Article | 17 October 2003 Paper

Optical waveguide fabrication inside transparent materials by use of plasma channeling induced by tailored femtosecond laser

Masanao Kamata, Kosuke Ohta, Minoru Obara, Hiroshi Sekita

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.479241

KEYWORDS: Refractive index, Waveguides, Femtosecond phenomena, Plasma, Silica, Pulsed laser operation, Laser irradiation, Glasses, Photonic devices, Laser processing

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Proceedings Article | 17 October 2003 Paper

Femtosecond laser interferometric processing of Nd:GGG planar optical waveguide

Ken Oi, Minoru Obara, Tetsumi Sumiyoshi

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.479243

KEYWORDS: Waveguides, Femtosecond phenomena, Interferometry, Laser ablation, Absorption, Thin films, Semiconductor lasers, Optical microscopes, Laser processing, Waveguide lasers

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Proceedings Article | 17 October 2003 Paper

Femtosecond laser processing tailored for biomedical materials and laser power delivery through optical fibers

Minoru Obara, Kazue Ozono, Makoto Kanai, Hitoshi Sekita, Peter Atanasov

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.479575

KEYWORDS: Laser ablation, Picosecond phenomena, Femtosecond phenomena, Multimode fibers, Optical fibers, Bone, Teeth, Calcium, Phosphorus, Laser processing

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Proceedings Article | 17 October 2003 Paper

Heat-affected zone of metals ablated with femtosecond laser pulses

Yoichi Hirayama, Minoru Obara

Proceedings Volume 4977, (2003) https://doi.org/10.1117/12.479242

KEYWORDS: Laser ablation, Metals, Crystals, Etching, Femtosecond phenomena, Laser crystals, Iron, Sapphire lasers, Silver, Argon

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Proceedings Article | 12 September 2003 Paper

Photosensitizer delivery into tissue and cells by simultaneous application of laser-induced stress wave and heating

Makoto Ogura, Mitsuhiro Terakawa, Shunichi Sato, Hiroshi Ashida, Minoru Obara

Proceedings Volume 4949, (2003) https://doi.org/10.1117/12.476137

KEYWORDS: Skin, Fiber lasers, Laser tissue interaction, Photodynamic therapy, Laser therapeutics, Confocal microscopy, Sodium, Pulsed laser operation, Laser scanners, Microscopes

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Proceedings Article | 1 July 2003 Paper

Photoacoustic diagnosis of burns in rats: two-dimensional photoacoustic imaging of burned tissue

Mutsuo Yamazaki, Shunichi Sato, Daizo Saito, Yoshiaki Okada, Akira Kurita, Makoto Kikuchi, Hiroshi Ashida, Minoru Obara

Proceedings Volume 4960, (2003) https://doi.org/10.1117/12.477638

KEYWORDS: Photoacoustic spectroscopy, Tissue optics, Skin, Photoacoustic imaging, Biomedical optics, Time metrology, Blood, Injuries, Sensors, Wound healing

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Proceedings Article | 19 June 2003 Paper

Ablation processing of biomedical materials by ultrashort laser pulse ranging from 50 fs through 2 ps

Kazue Ozono, Minoru Obara, Jun Sakuma

Proceedings Volume 4978, (2003) https://doi.org/10.1117/12.478589

KEYWORDS: Laser ablation, Picosecond phenomena, Calcium, Teeth, Femtosecond phenomena, Bone, Phosphorus, Ultrafast phenomena, Sapphire lasers, Laser processing

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Proceedings Article | 19 June 2003 Paper

Intense ultrashort laser delivery through a graded index multimode fiber for medical application

Makoto Kanai, Lisa Kamino, Minoru Obara, Hitoshi Sekita

Proceedings Volume 4978, (2003) https://doi.org/10.1117/12.478590

KEYWORDS: Multimode fibers, Picosecond phenomena, Femtosecond phenomena, Fiber lasers, Optical fibers, Medium wave, Silica, Pulsed laser operation, Sapphire lasers, Numerical analysis

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Proceedings Article | 19 February 2003 Paper

Toward nanoprocess applications with laser-cooled silicon atoms

Hiroshi Kumagai, Yuichi Asakawa, Katsumi Midorikawa, Minoru Obara

Proceedings Volume 4830, (2003) https://doi.org/10.1117/12.486587

KEYWORDS: Silicon, Chemical species, Light sources, Semiconductor lasers, Collimation, Laser applications, Deep ultraviolet, Frequency conversion, Laser development, Lithography

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Proceedings Article | 13 September 2002 Paper

Tailored ablation processing of advanced materials by femtosecond laser pulse

Kazue Ozono, Tomohiro Imahoko, Minoru Obara

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482105

KEYWORDS: Laser ablation, Femtosecond phenomena, Gallium nitride, Etching, Pulsed laser operation, Sapphire lasers, Laser development, Laser systems engineering, Gallium, Mirrors

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Proceedings Article | 27 June 2002 Paper

Development for medical surgical system with function variability and flexible delivery using dual-wavelength infrared fiber laser

Kyota Naruse, Tsunenori Arai, Satoko Kawauchi, Tetsumi Sumiyoshi, Shoichi Kiyoshima, Miya Ishihara, Shunichi Sato, Makoto Kikuchi, Hitoshi Sekita, Minoru Obara

Proceedings Volume 4617, (2002) https://doi.org/10.1117/12.472515

KEYWORDS: Fiber lasers, Optical filters, Sapphire, Infrared radiation, Laser cutting, Infrared lasers, Laser dentistry, Tissues, Beam delivery, Laser tissue interaction

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Proceedings Article | 17 June 2002 Paper

Transdermal delivery of photosensitizer by laser-induced stress wave

Makoto Ogura, Shunichi Sato, Masahiko Kuroki, Hitoshi Wakisaka, Satoko Kawauchi, Miya Ishihara, Makoto Kikuchi, Masahiko Yoshioka, Hiroshi Ashida, Minoru Obara

Proceedings Volume 4609, (2002) https://doi.org/10.1117/12.432076

KEYWORDS: Skin, Opacity, Liquid crystals, Luminescence, Defense and security, Solids, Sodium, Plasma, Electronics, HVAC controls

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Proceedings Article | 10 June 2002 Paper

Photoacoustic signal measurement for burned skins in the spectral range of 500-650 nm: experiment with rat burn models

Mutsuo Yamazaki, Shunichi Sato, Daizo Saito, Masanori Fujita, Yoshiaki Okada, Makoto Kikuchi, Hiroshi Ashida, Minoru Obara

Proceedings Volume 4618, (2002) https://doi.org/10.1117/12.469862

KEYWORDS: Photoacoustic spectroscopy, Skin, Transducers, Blood, Tissues, Optical parametric oscillators, Acoustics, Quartz, Biomedical optics, Defense and security

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Proceedings Article | 26 March 2002 Paper

Hollow-waveguide-based laser-to-ultrasound transducer for drug delivery application

Shunichi Sato, Makoto Ogura, Minoru Obara, Yi-Wei Shi, Yuji Matsuura, Mitsunobu Miyagi, Hiroshi Ashida

Proceedings Volume 4616, (2002) https://doi.org/10.1117/12.463814

KEYWORDS: Tissues, Hollow waveguides, Transducers, Laser applications, Plasma, Waveguides, Acoustics, Ultrasonography, Rhodamine B, Laser tissue interaction

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Proceedings Article | 24 October 2001 Paper

Measurement of photoacoustic signals from skin: potential application to burn depth estimation

Shunichi Sato, Tomoaki Shimada, Tsunenori Arai, Makoto Kikuchi, Minoru Obara, Hiroshi Ashida

Proceedings Volume 4434, (2001) https://doi.org/10.1117/12.446677

KEYWORDS: Skin, Photoacoustic spectroscopy, Transducers, Injuries, Tissues, Signal detection, Absorption, Blood, Acoustics, Natural surfaces

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Proceedings Article | 9 July 2001 Paper

Channeling in myocardium tissue through nanosecond pulsed laser photodisruption at visible and near-infrared wavelengths

Makoto Ogura, Shunichi Sato, Tsunenori Arai, Miya Ishihara, Satoko Kawauchi, Takemi Matsui, Akira Kurita, Makoto Kikuchi, Hitoshi Wakisaka, Hiroshi Ashida, Minoru Obara

Proceedings Volume 4257, (2001) https://doi.org/10.1117/12.434714

KEYWORDS: Laser ablation, Laser optics, Laser tissue interaction, Pulsed laser operation, Tissue optics, Tissues, Plasma, Laser irradiation, Laser damage threshold, Q switched lasers

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Proceedings Article | 9 July 2001 Paper

Nanosecond-time-response temperature measurements using radiation thermometry during 193-nm and 247-nm pulsed light irradiation: comparison of corneal surface temperature histories

Miya Ishihara, Tsunenori Arai, Shunichi Sato, Yuji Morimoto, Minoru Obara, Makoto Kikuchi

Proceedings Volume 4257, (2001) https://doi.org/10.1117/12.434712

KEYWORDS: Temperature metrology, Absorption, Cornea, Laser ablation, Excimer lasers, Radiometry, Radiation thermometry, Light sources, Defense and security, Laser development

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Proceedings Article | 9 July 2001 Paper

Theoretical study of variable function (cutting/coagulating) laser surgical system using continuous-wave 3 um, 2u m cascade Ho3+:ZBLAN fiber laser

Kyota Naruse, Tsunenori Arai, Satoko Kawauchi, Tetsumi Sumiyoshi, Shoichi Kiyoshima, Miya Ishihara, Shunichi Sato, Makoto Kikuchi, Hitoshi Sekita, Minoru Obara

Proceedings Volume 4257, (2001) https://doi.org/10.1117/12.434718

KEYWORDS: Fiber lasers, Quantum cascade lasers, Tissues, Laser cutting, Absorption, Laser tissue interaction, Laser dentistry, Continuous wave operation, Microscopes, Laser systems engineering

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Proceedings Article | 15 May 2001 Paper

Compact holographic memory system using one-beam geometry in photorefractive crystal

Hideta Mitsuhashi, Minoru Obara

Proceedings Volume 4277, (2001) https://doi.org/10.1117/12.426806

KEYWORDS: Crystals, Holography, Multiplexing, Laser crystals, Holograms, Semiconductor lasers, Diffraction, Light sources, Spatial light modulators, Sensors

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Proceedings Article | 15 May 2001 Paper

All optical control of self-pumped phase conjugation from BaTiO3:Co photorefractive crystal

Yoshihiro Koizumi, Go Urushibata, Minoru Obara

Proceedings Volume 4277, (2001) https://doi.org/10.1117/12.426792

KEYWORDS: Beam controllers, Phase conjugation, Crystals, Reflectivity, Laser crystals, Image processing, Distortion, Control systems, High power lasers, Mirrors

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Proceedings Article | 3 May 2001 Paper

Sum-frequency generation of a cw single-frequency-mode coherent light at 252 nm for laser cooling of silicon

Yuichi Asakawa, Hiroshi Kumagai, Katsumi Midorikawa, Minoru Obara

Proceedings Volume 4269, (2001) https://doi.org/10.1117/12.424470

KEYWORDS: Semiconductor lasers, Chemical species, Crystals, Silicon, Light sources, Frequency conversion, Laser crystals, Nonlinear crystals, Continuous wave operation, Deep ultraviolet

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Proceedings Article | 25 January 2001 Paper

Fabrication of Nd:Gd3Ga5O12 and self Q-switched Nd,Cr:Gd3Ga5O12 laser waveguides by pulsed laser deposition method

Yoshihisa Ishida, Sachiyo Fukaya, Tomoyuki Shimoda, Minoru Obara

Proceedings Volume 4184, (2001) https://doi.org/10.1117/12.413992

KEYWORDS: Thin films, Neodymium, Waveguides, Chromium, Ions, Pulsed laser deposition, Crystals, YAG lasers, Q switched lasers, Laser ablation

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Proceedings Article | 25 January 2001 Paper

Ablation of BN ceramics by femtosecond and picosecond laser pulses

Yoichi Hirayama, Minoru Obara

Proceedings Volume 4184, (2001) https://doi.org/10.1117/12.414006

KEYWORDS: Ceramics, Laser ablation, Sapphire lasers, Nd:YAG lasers, Picosecond phenomena, Femtosecond phenomena, Boron, Pulsed laser operation, Metals, Scanning electron microscopy

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Proceedings Article | 16 November 2000 Paper

Plasma-mediated tissue ablation with nanosecond laser pulses in the spectral region from ultraviolet to near infrared: in-vitro study with porcine myocardium tissue

Shunichi Sato, Makoto Ogura, Tomoaki Shimada, Miya Ishihara, Tsunenori Arai, Takemi Matsui, Akira Kurita, Minoru Obara, Makoto Kikuchi, Hitoshi Wakisaka, Hiroshi Ashida

Proceedings Volume 4161, (2000) https://doi.org/10.1117/12.409316

KEYWORDS: Laser ablation, Laser tissue interaction, Laser optics, Laser irradiation, Plasma, Tissue optics, Pulsed laser operation, Nd:YAG lasers, Optical microscopes, In vitro testing

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Proceedings Article | 6 November 2000 Paper

Time-resolved dynamics of plasma self-channeling and bulk modification in silica glasses induced by a high-intensity femtosecond laser

Sung-Hak Cho, Hiroshi Kumagai, Katsumi Midorikawa, Minoru Obara

Proceedings Volume 4088, (2000) https://doi.org/10.1117/12.405677

KEYWORDS: Plasma, Glasses, Refractive index, Laser beam diagnostics, Silica, Picosecond phenomena, Optical damage, Femtosecond phenomena, Ionization, Optical fibers

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Proceedings Article | 16 August 2000 Paper

New material processing of AIN ceramic with femtosecond, nanosecond, and microsecond laser ablation

Hiroyuki Yabe, Yoichi Hirayama, Minoru Obara

Proceedings Volume 4065, (2000) https://doi.org/10.1117/12.407315

KEYWORDS: Carbon dioxide lasers, Ceramics, Aluminum, Excimer lasers, Laser ablation, Resistance, Sapphire lasers, Femtosecond phenomena, Laser processing, Absorption

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Proceedings Article | 16 August 2000 Paper

Functional material processing using intense femtosecond, nanosecond, and microsecond laser ablation

Minoru Obara, Hiroyuki Yabe, Yoichi Hirayama, Kousuke Takahashi, Kentaro Furusawa, Fabien Barnier, Yong Kim

Proceedings Volume 4065, (2000) https://doi.org/10.1117/12.407349

KEYWORDS: Laser ablation, Carbon dioxide lasers, Ceramics, Excimer lasers, Crystals, Aluminum, Femtosecond phenomena, Laser processing, Sapphire lasers, Laser crystals

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Proceedings Article | 16 August 2000 Paper

Fabrication of Nd,Cr codoped GGG waveguide structure by nanosecond KrF laser deposition

Tomoyuki Shimoda, Sachiyo Fukaya, Yoshihisa Ishida, Yong Kim, Minoru Obara

Proceedings Volume 4065, (2000) https://doi.org/10.1117/12.407356

KEYWORDS: Chromium, Neodymium, Ions, Thin films, Waveguides, Laser ablation, Waveguide lasers, Q switched lasers, Luminescence, YAG lasers

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Proceedings Article | 13 June 2000 Paper

Laser-tissue interaction of a continuous-wave 2-um, 3-um cascade oscillation fiber laser: sharp incision with controlled coagulation layer thickness

Tsunenori Arai, Tetsumi Sumiyoshi, Kyota Naruse, Miya Ishihara, Shunichi Sato, Makoto Kikuchi, Tadashi Kasamatsu, Hitoshi Sekita, Minoru Obara

Proceedings Volume 3914, (2000) https://doi.org/10.1117/12.388052

KEYWORDS: Fiber lasers, Laser tissue interaction, Laser cutting, Laser systems engineering, Continuous wave operation, Laser development, Photography, Tissues, Laser therapeutics, Liver

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Proceedings Article | 13 June 2000 Paper

Myocardium tissue ablation with nanosecond ultraviolet pulses: in-vitro study with porcine myocardium tissues

Tomoaki Shimada, Shunichi Sato, Miya Ishihara, Tsunenori Arai, Takemi Matsui, Akira Kurita, Makoto Kikuchi, Hitoshi Wakisaka, Hiroshi Ashida, Minoru Obara

Proceedings Volume 3914, (2000) https://doi.org/10.1117/12.388029

KEYWORDS: Laser ablation, Tissues, Tissue optics, Optical parametric oscillators, Ultraviolet radiation, Laser tissue interaction, Signal attenuation, Nd:YAG lasers, In vitro testing, Absorption

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Proceedings Article | 13 June 2000 Paper

65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea

Miya Ishihara, Shunichi Sato, Tsunenori Arai, Minoru Obara, Makoto Kikuchi

Proceedings Volume 3914, (2000) https://doi.org/10.1117/12.388031

KEYWORDS: Cornea, Excimer lasers, Temperature metrology, Laser ablation, Mercury cadmium telluride, Sensors, Photovoltaic detectors, Photovoltaics, Tissues, Signal detection

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Proceedings Article | 1 February 2000 Paper

Characteristics and mechanism of myocardium tissue laser ablation: in-vitro study for transmyocardial laser revascularization

Shunichi Sato, Tomoaki Shimada, Makoto Ogura, Miya Ishihara, Tsunenori Arai, Takemi Matsui, Akira Kurita, Minoru Obara, Makoto Kikuchi, Hitoshi Wakisaka, Hiroshi Ashida

Proceedings Volume 3885, (2000) https://doi.org/10.1117/12.376956

KEYWORDS: Laser ablation, Laser tissue interaction, Plasma, Tissues, Optical parametric oscillators, Nd:YAG lasers, In vitro testing, Q switched lasers, Ultraviolet radiation, Absorption

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Proceedings Article | 1 February 2000 Paper

Pulse duration dependence of metal ablation using a femtosecond titanium sapphire laser

Kentaro Furusawa, Kousuke Takahashi, Sung-Hak Cho, Hiroshi Kumagai, Katsumi Midorikawa, Minoru Obara

Proceedings Volume 3885, (2000) https://doi.org/10.1117/12.377001

KEYWORDS: Laser ablation, Diffusion, Metals, Pulsed laser operation, Silver, Femtosecond phenomena, Ultrafast phenomena, Copper, Micromachining, Titanium

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Proceedings Article | 1 February 2000 Paper

Fabrication of Nd, Cr co-doped GGG thin films for a Q-switched waveguide laser by the two-target pulsed KrF laser deposition method

Sachiyo Fukaya, Tetsu Hasegawa, Yoshihisa Ishida, Minoru Obara

Proceedings Volume 3885, (2000) https://doi.org/10.1117/12.376979

KEYWORDS: Chromium, Thin films, Neodymium, Ions, Laser ablation, Waveguide lasers, Q switched lasers, YAG lasers, Crystals, Pulsed laser deposition

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Proceedings Article | 1 February 2000 Paper

Fabrication study of double-cladding structure in optical fibers using plasma channeling induced by a femtosecond laser

Sung-Hak Cho, Hiroshi Kumagai, Katsumi Midorikawa, Minoru Obara

Proceedings Volume 3885, (2000) https://doi.org/10.1117/12.376974

KEYWORDS: Refractive index, Plasma, Optical fibers, Multimode fibers, Cladding, Femtosecond phenomena, Silica, Optical communications, Optical sensors, Channel projecting optics

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Proceedings Article | 21 October 1999 Paper

Ultrahigh-gain Ni-like Kr soft x-ray laser by optical field ionization-initiated transient collisional excitation scheme

Oki Maya, Yutaka Nagata, Minoru Obara, Yoshinobu Aoyagi, Katsumi Midorikawa

Proceedings Volume 3776, (1999) https://doi.org/10.1117/12.366662

KEYWORDS: Ions, Krypton, X-ray lasers, Plasma, Ionization, Pulsed laser operation, Picosecond phenomena, Laser energy, Laser optics, X-ray optics

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Proceedings Article | 21 October 1999 Paper

Phase-matched high-order-harmonic generation by self-guided intense femtosecond laser pulses

Katsumi Midorikawa, Yusuke Tamaki, Jiro Itatani, Minoru Obara

Proceedings Volume 3776, (1999) https://doi.org/10.1117/12.366683

KEYWORDS: Neon, Phase shift keying, Femtosecond phenomena, Sapphire lasers, Plasma, Diffraction, Extreme ultraviolet, Energy efficiency, Argon, Phase matching

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Proceedings Article | 15 July 1999 Paper

Modification in optical fibers using high-intensity femtosecond lasers

Sung-Hak Cho, Hiroshi Kumagai, Katsumi Midorikawa, Minoru Obara

Proceedings Volume 3618, (1999) https://doi.org/10.1117/12.352680

KEYWORDS: Refractive index, Multimode fibers, Plasma, Optical fibers, Cladding, Silica, Femtosecond phenomena, Fiber lasers, Channel projecting optics, Optical sensors

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Proceedings Article | 14 June 1999 Paper

Temperature monitoring by infrared radiation measurements during ArF excimer laser ablation with cornea

Miya Ishihara, Tsunenori Arai, Shunichi Sato, Hironori Nakano, Minoru Obara, Makoto Kikuchi

Proceedings Volume 3601, (1999) https://doi.org/10.1117/12.350017

KEYWORDS: Laser ablation, Cornea, Temperature metrology, Excimer lasers, Sensors, Infrared radiation, Time metrology, Pulsed laser operation, Thermography, Laser tissue interaction

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Proceedings Article | 26 May 1999 Paper

Photorefractive coherence gating for laser interferometric applications

Akira Shiratori, Minoru Obara

Proceedings Volume 3610, (1999) https://doi.org/10.1117/12.349222

KEYWORDS: Interferometry, Scattering, Laser scattering, Crystals, Laser crystals, Ferroelectric materials, Signal detection, Thin films, Light scattering, Laser interferometry

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Proceedings Article | 14 September 1998 Paper

Observation of self-channeling and modification in optical fibers using a high-intensity femtosecond laser

Sung-Hak Cho, Hiroshi Kumagai, Isao Yokota, Katsumi Midorikawa, Minoru Obara

Proceedings Volume 3343, (1998) https://doi.org/10.1117/12.321532

KEYWORDS: Plasma, Optical fibers, Fiber lasers, Multimode fibers, Femtosecond phenomena, Refractive index, Silica, Sapphire lasers, Modulation, Optical filters

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Proceedings Article | 14 September 1998 Paper

Planar laser and nonlinear optical waveguides fabricated by pulsed laser deposition

Minoru Obara, Kyoichi Adachi, Tetsu Hasegawa, Akihiko Machida, Sachiyo Fukaya, Hiroshi Kumagai, Katsumi Midorikawa

Proceedings Volume 3343, (1998) https://doi.org/10.1117/12.321606

KEYWORDS: Thin films, Waveguides, Pulsed laser deposition, YAG lasers, Laser ablation, Annealing, Crystals, Ferroelectric materials, Planar waveguides, Cobalt

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Proceedings Article | 29 June 1998 Paper

Development of a high-power TEA CO2 laser pumped by an all-solid state exciter and its application to new material processing

Minoru Obara, Hiroyuki Yabe, Katsumi Midorikawa

Proceedings Volume 3403, (1998) https://doi.org/10.1117/12.311964

KEYWORDS: Carbon dioxide lasers, Aluminum, Resistance, Ceramics, Laser ablation, Gas lasers, Absorption, Silicon, Laser energy, Photoemission spectroscopy

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Proceedings Article | 13 May 1998 Paper

Comparison of transient measurements of infrared radiation and stress waves for practical ablation monitoring during photorefractive keratectomy

Miya Ishihara, Tsunenori Arai, Makoto Kikuchi, Hironori Nakano, Satoko Kawauchi, Minoru Obara

Proceedings Volume 3254, (1998) https://doi.org/10.1117/12.308179

KEYWORDS: Laser ablation, Infrared radiation, Excimer lasers, Temperature metrology, Cornea, Transducers, Sensors, Acoustics, Ferroelectric polymers, Laser irradiation

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Proceedings Article | 1 May 1998 Paper

Embryo viscoelasticity measurement by fiber optic system: system development and model experiment

Harumi Itoh, Tsunenori Arai, Makoto Kikuchi, Naoko Morita, Minoru Obara

Proceedings Volume 3253, (1998) https://doi.org/10.1117/12.308019

KEYWORDS: Fiber optics, Fiber optics tests, Reflectometry, Optical fibers, Optical testing, Systems modeling, Dynamical systems, Photography, Helium neon lasers, Actuators

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Proceedings Article | 26 May 1997 Paper

Novel monitoring of corneal surface hydration during photorefractive keratectomy using pulsed photothermal radiometry: in-vitro study

Satoko Kawauchi, Hiroko Matsuyama, Minoru Obara, Miya Ishihara, Tsunenori Arai, Makoto Kikuchi, Masayoshi Katoh

Proceedings Volume 2971, (1997) https://doi.org/10.1117/12.275111

KEYWORDS: Cornea, Absorption, Infrared radiation, Laser ablation, In vitro testing, Excimer lasers, Radiometry, Sensors, Time metrology, Infrared sensors

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Proceedings Article | 4 April 1997 Paper

Growth and characterization of Nd:YAG epitaxial planar waveguides by pulsed laser deposition

Mizunori Ezaki, Minoru Obara, Kyoichi Adachi, Hiroshi Kumagai, Koichi Toyoda

Proceedings Volume 3092, (1997) https://doi.org/10.1117/12.270235

KEYWORDS: YAG lasers, Nd:YAG lasers, Silicon, Crystals, Pulsed laser deposition, Thin films, Neodymium, X-ray diffraction, Ytterbium, Waveguides

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Proceedings Article | 4 April 1997 Paper

Photorefractive phase-conjugator coupled-cavity diode laser for high spectral-brightness operation

Akira Shiratori, Minoru Obara

Proceedings Volume 3092, (1997) https://doi.org/10.1117/12.270223

KEYWORDS: Semiconductor lasers, Phase conjugation, Crystals, Backscatter, Mirrors, Ferroelectric materials, Laser crystals, Reflectivity, Four wave mixing, Spectrum analysis

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Proceedings Article | 4 April 1997 Paper

Rust and paint stripping from power transmission towers with a pulsed Nd:YAG laser

Shu-ichi Ashidate, Minoru Obara

Proceedings Volume 3092, (1997) https://doi.org/10.1117/12.270177

KEYWORDS: Pulsed laser operation, Zinc, Coating, Laser energy, Chemical analysis, Reflectivity, Nd:YAG lasers, Carbon dioxide lasers, Excimer lasers, Laser applications

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Proceedings Article | 8 April 1996 Paper

Novel photorefractive sensing device for laser surface inspection

Akira Shiratori, Minoru Obara

Proceedings Volume 2703, (1996) https://doi.org/10.1117/12.237730

KEYWORDS: Crystals, Inspection, Diffraction, Laser crystals, Diffraction gratings, Ferroelectric materials, Reflectors, Holograms, Spatial resolution, Data storage

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Proceedings Article | 25 September 1995 Paper

Optical-field-induced ionization x-ray laser studies using a preformed plasma

Katsumi Midorikawa, Yutaka Nagata, Minoru Obara, Koichi Toyoda

Proceedings Volume 2520, (1995) https://doi.org/10.1117/12.221662

KEYWORDS: Plasma, Ionization, Lithium, Pulsed laser operation, X-ray lasers, Ions, X-ray optics, Laser optics, X-rays, Temperature metrology

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Proceedings Article | 31 March 1995 Paper

Selective material ablation by the TEA CO2 laser

Tetsumi Sumiyoshi, Akira Shiratori, Yutaka Ninomiya, Minoru Obara

Proceedings Volume 2502, (1995) https://doi.org/10.1117/12.204977

KEYWORDS: Carbon dioxide lasers, Laser ablation, Absorption, Quartz, Gas lasers, Aluminum, Hydrogen, Nonlinear crystals, Protactinium, Scanning electron microscopy

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Proceedings Article | 17 August 1994 Paper

Signal analysis of fiber optic probe method from Ho:YAG laser ablation bubble

Miya Ishihara, Makoto Hasegawa, Masato Yano, Akio Nakajima, Tsunenori Arai, Makoto Kikuchi, Minoru Obara

Proceedings Volume 2134, (1994) https://doi.org/10.1117/12.182950

KEYWORDS: Fiber optics, Laser ablation, Signal analysis, Photography

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Proceedings Article | 21 July 1994 Paper

Surface modification of semiconductors by laser-induced surface electromagnetic wave etching

Mizunori Ezaki, Hiroshi Kumagai, Koichi Toyoda, Minoru Obara

Proceedings Volume 2125, (1994) https://doi.org/10.1117/12.180861

KEYWORDS: Holography, Etching, Semiconductor lasers, Gallium arsenide, Semiconductors, Polarization, Nd:YAG lasers, Laser irradiation, Electromagnetic radiation, Laser scattering

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Proceedings Article | 14 July 1993 Paper

Measurement for optical properties of mitochondria in vitro

Akio Nakajima, Miya Ishihara, Tsunenori Arai, Yuji Morimoto, Makoto Kikuchi, Fumihiko Kannari, Minoru Obara

Proceedings Volume 1883, (1993) https://doi.org/10.1117/12.148028

KEYWORDS: Absorption, Transmittance, Tissue optics, Optical properties, Optical testing, Liver, In vitro testing, Therapeutics, Tissues, Particles

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Proceedings Article | 7 July 1993 Paper

Measurement of cavity collapse time by probe technique on water, agar, and vascular tissue during Ho:YAG laser contact ablation

Miya Ishihara, Akio Nakajima, Tsunenori Arai, Makoto Kikuchi, H. Kannari, Minoru Obara

Proceedings Volume 1882, (1993) https://doi.org/10.1117/12.147680

KEYWORDS: Laser ablation, Fiber lasers, Backscatter, Laser tissue interaction, Laser beam diagnostics, Tissues, Laser scattering, Helium neon lasers, Optical testing, Fiber optics

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Proceedings Article | 6 June 1993 Paper

Output characteristics of high-pressure 585.3-nm atomic neon laser pumped by transverse discharge

Chuen-Huei Yang, Koji Itoh, Tomohiro Araki, Fumihiko Kannari, Minoru Obara

Proceedings Volume 1871, (1993) https://doi.org/10.1117/12.145240

KEYWORDS: Neon, Laser energy, Gold vapor lasers, Laser therapeutics, Luminescence, Photodynamic therapy, Capacitors, Hydrogen, Laser scattering, Dye lasers

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Proceedings Article | 4 May 1993 Paper

Multikilowatt TEA CO2 laser driven by an all-solid-state exciter

Hidekazu Hatanaka, Katsumi Midorikawa, Minoru Obara, Hideo Tashiro

Proceedings Volume 1810, (1993) https://doi.org/10.1117/12.144615

KEYWORDS: Carbon dioxide lasers, Field effect transistors, Magnetism, Gas lasers, Switches, Pulse generators, Semiconductors, Head, Magnetic semiconductors, High power lasers

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Proceedings Article | 4 May 1993 Paper

Theoretical anti-Stokes conversion of VUV spectrum by dual-wavelength-pumped stimulated Raman scattering

Tsuneo Nakata, Fumihiko Kannari, Minoru Obara

Proceedings Volume 1810, (1993) https://doi.org/10.1117/12.144583

KEYWORDS: Raman spectroscopy, Vacuum ultraviolet, Raman scattering, Four wave mixing, Nonlinear optics, Light scattering, Laser scattering, Scattering, Polarization, Chemical lasers

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Proceedings Article | 4 May 1993 Paper

High-performance pulsed HF chemical lasers

Tetsumi Sumiyoshi, Shu-ichi Ashidate, Fumihiko Kannari, Minoru Obara

Proceedings Volume 1810, (1993) https://doi.org/10.1117/12.144643

KEYWORDS: Hydrogen fluoride lasers, Optical fibers, Chemical lasers, Glasses, Carbon dioxide, Surface finishing, Pulsed laser operation, Tissue optics, Diffraction gratings, Carbon dioxide lasers

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Proceedings Article | 1 May 1992 Paper

Analysis of gas degradation under a closed-cycle high-repetition-rate operation of a transversely excited atmospheric CO2 laser

Hirokazu Hokazono, Naoki Kobayashi, Minoru Obara, Katsumi Midorikawa, Hideo Tashiro

Proceedings Volume 1628, (1992) https://doi.org/10.1117/12.58973

KEYWORDS: Carbon dioxide lasers, Carbon dioxide, Gas lasers, Molecules, Carbon monoxide, Molecular lasers, Solids, Chromium, Laser development, Plasma

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