Prof. Oleg G. Okhotnikov Profile

Prof. Oleg G. Okhotnikov

at Tampere Univ

SPIE Involvement:

Author

Publications (50)

Proceedings Article | 27 April 2016 Paper

Paper

Optical fiber amplifier with spectral compression elements for high-power laser pulse generation

Andrei Fotiadi, Dmitry Korobko, Oleg Okhotnikov, Igor Zolotovskii

Proceedings Volume 9894, 989411 (2016) https://doi.org/10.1117/12.2223637

KEYWORDS: Optical amplifiers, High power lasers, Fiber amplifiers, High power fiber amplifiers, Scanning probe microscopy, Dispersion, Pulsed laser operation, Picosecond phenomena, Frequency modulation, Optical filters, Amplifiers, Systems modeling, Gaussian filters

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Proceedings Article | 11 March 2016 Paper

Paper

Optical amplifiers and lasers based on tapered fiber geometry for power and energy scaling with low signal distortion

Valery Filippov, Yuri Chamorovskii, Konstantin Golant, Andrei Vorotynskii, Oleg Okhotnikov

Proceedings Volume 9728, 97280V (2016) https://doi.org/10.1117/12.2218051

KEYWORDS: Fiber amplifiers, Fiber lasers, Optical amplifiers, Laser optics, Absorption, Ytterbium, Q switched lasers, Amplifiers, Picosecond phenomena, Wave propagation, Modulation

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Proceedings Article | 10 March 2016 Paper

Paper

A 1.5-W frequency doubled semiconductor disk laser tunable over 40 nm at around 745 nm

Esa Saarinen, Jari Lyytikäinen, Sanna Ranta, Antti Rantamäki, Antti Saarela, Alexei Sirbu, Vladimir Iakovlev, Eli Kapon, Oleg Okhotnikov

Proceedings Volume 9734, 97340P (2016) https://doi.org/10.1117/12.2209384

KEYWORDS: Semiconductor lasers, Semiconductors, Disk lasers, Semiconducting wafers, Second-harmonic generation, Crystals, Diodes, Chemical elements, Vertical external cavity surface emitting lasers, Mirrors, Nonlinear crystals, Diamond

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Proceedings Article | 9 March 2015 Paper

Paper

Green (In,Ga,Al)P-GaP light-emitting diodes grown on high-index GaAs surfaces

Nikolay Ledentsov, V. Shchukin, J. Lyytikäinen, O. Okhotnikov, N. Cherkashin, Yu Shernyakov, A. Payusov, Nikita Gordeev, M. Maximov, S. Schlichting, F. Nippert, A. Hoffmann

Proceedings Volume 9383, 93830E (2015) https://doi.org/10.1117/12.2083953

KEYWORDS: Electroluminescence, Gallium arsenide, Light emitting diodes, Superlattices, Transmission electron microscopy, Cladding, Electrons, Heterojunctions, Aluminium gallium indium phosphide, Aluminum

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Proceedings Article | 4 March 2015 Paper

Paper

Power and wavelength scaling using semiconductor disk laser-bismuth fiber MOPA systems

Juuso Heikkinen, Regina Gumenyuk, Antti Rantamäki, Jari Lyytikäinen, Tomi Leinonen, Igor Zolotovskii, Mikhail Melkumov, Evgeny Dianov, Oleg Okhotnikov

Proceedings Volume 9349, 93490E (2015) https://doi.org/10.1117/12.2076805

KEYWORDS: Fiber amplifiers, Semiconductor lasers, Mode locking, Mirrors, Semiconductors, Fiber lasers, Disk lasers, Quantum wells, Optical amplifiers, Picosecond phenomena

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Proceedings Article | 4 March 2015 Paper

Paper

Towards high power flip-chip long-wavelength semiconductor disk lasers

A. Rantamaki, E. Saarinen, J. Lyytikäinen, J. Kontio, J. Heikkinen, Kimmo Lahtonen, M. Valden, O. Okhotnikov

Proceedings Volume 9349, 934908 (2015) https://doi.org/10.1117/12.2076795

KEYWORDS: Reflectivity, Semiconductors, Mirrors, Wafer bonding, Diamond, Semiconductor lasers, Silicon, Aluminum, Dielectrics, Metals

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Proceedings Article | 4 March 2015 Paper

Paper

Recent progress in wafer-fused VECSELs emitting in the 1310nm waveband

A. Sirbu, A. Rantamaki, V. Iakovlev, A. Mereuta, A. Caliman, N. Volet, J. Lyytikäinen, O. Okhotnikov, E. Kapon

Proceedings Volume 9349, 934907 (2015) https://doi.org/10.1117/12.2079752

KEYWORDS: Mirrors, Diamond, Quantum wells, Semiconducting wafers, Etching, Mirror structures, Absorption, Gallium arsenide, Wafer bonding, Distributed Bragg reflectors

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Proceedings Article | 7 March 2014 Paper

Paper

Generation of pulse trains with high-repetition-rate in anomalous dispersion decreasing fibers

Dmitry Korobko, Oleg Okhotnikov, Alex Sysoliatin, Igor Zolotovskii

Proceedings Volume 8980, 89801N (2014) https://doi.org/10.1117/12.2036331

KEYWORDS: Optical fibers, Modulation, Dispersion, Wave propagation, Frequency modulation, Solitons, Raman scattering, Raman spectroscopy, Numerical simulations, Amplitude modulation

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Proceedings Article | 3 March 2014 Paper

Paper

Wafer-fused VECSELs emitting in the 1310nm waveband

A. Sirbu, K. Pierscinski, A. Mereuta, V. Iakovlev, A. Caliman, Z. Micovic, N. Volet, J. Rautiainen, J. Heikkinen, J. Lyytikainen, A. Rantamäki, O. Okhotnikov, E. Kapon

Proceedings Volume 8966, 89660G (2014) https://doi.org/10.1117/12.2039692

KEYWORDS: Mirrors, Diamond, Semiconducting wafers, Quantum wells, Laser applications, Optical pumping, Wafer-level optics, Luminescence, Vertical cavity surface emitting lasers, Fiber coupled lasers

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Proceedings Article | 3 March 2014 Paper

Paper

Carbon nanotube mode-locked vertical external-cavity surface-emitting laser

K. Seger, N. Meiser, S. Choi, B. Jung, D.-I. Yeom, F. Rotermund, O. Okhotnikov, F. Laurell, V. Pasiskevicius

Proceedings Volume 8966, 896606 (2014) https://doi.org/10.1117/12.2041615

KEYWORDS: Mode locking, Semiconductors, Picosecond phenomena, Absorption, Semiconductor lasers, Modulation, Mirrors, Solids, Carbon nanotubes, Silica

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Proceedings Article | 28 February 2014 Paper

Paper

Femtosecond Cr:ZnS laser at 2.35 µm mode-locked by carbon nanotubes

Nikolai Tolstik, Oleg Okhotnikov, Evgeni Sorokin, Irina Sorokina

Proceedings Volume 8959, 89591A (2014) https://doi.org/10.1117/12.2040757

KEYWORDS: Mode locking, Mirrors, Pulsed laser operation, Carbon nanotubes, Mid-IR, Output couplers, Laser applications, Graphene, Femtosecond phenomena, Absorption

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Proceedings Article | 22 March 2013 Paper

Paper

Fundamental mode evolution in long, large-core (>100 μm) adiabatic tapers

Juho Kerttula, Valery Filippov, Yuri Chamorovskii, Vasily Ustimchik, Oleg Okhotnikov

Proceedings Volume 8601, 860121 (2013) https://doi.org/10.1117/12.2001249

KEYWORDS: Optical fibers, Cladding, Near field, Multimode fibers, Refractive index, Single mode fibers, Polarization, Polarizers, Beam propagation method, Beam shaping

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Proceedings Article | 18 February 2013 Paper

Paper

Recent progress in wafer-fused VECSELs emitting in the 1310nm and 1550nm bands

A. Sirbu, A. Caliman, A. Mereuta, K. Pierscinski, A. Rantamäki, J. Lyytikäinen, J. Rautiainen, V. Iakovlev, N. Volet, O. Okhotnikov, E. Kapon

Proceedings Volume 8606, 86060F (2013) https://doi.org/10.1117/12.2002461

KEYWORDS: Mirrors, Semiconducting wafers, Optical pumping, Oxygen, Fabry–Perot interferometers, Reflectivity, Electroluminescence, Output couplers, Fiber lasers

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Proceedings Article | 16 February 2012 Paper

Paper

A comparative study of tapered fiber laser configurations

J. Kerttula, V. Filippov, Yu. Chamorovskii, V. Ustimchik, K. Golant, O. Okhotnikov

Proceedings Volume 8237, 82370W (2012) https://doi.org/10.1117/12.908147

KEYWORDS: Fiber lasers, Absorption, Cladding, Mirrors, Spatial filters, Fourier transforms, Picosecond phenomena, Ions, Single mode fibers, Laser damage threshold

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Proceedings Article | 15 February 2012 Paper

Paper

High-power quantum dot semiconductor disk lasers

Jussi Rautiainen, Mantas Butkus, Igor Krestnikov, Edik Rafailov, Oleg Okhotnikov

Proceedings Volume 8242, 824207 (2012) https://doi.org/10.1117/12.905067

KEYWORDS: Mirrors, Quantum dots, Semiconductor lasers, Semiconductors, Disk lasers, Output couplers, Frequency conversion, Diamond, Gallium arsenide, Harmonic generation

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Proceedings Article | 22 March 2011 Paper

Paper

Multiple gain cavity for power scaling in passively mode-locked semiconductor disk laser

A. Rantamäki, E. Saarinen, J. Lyytikäinen, O. Okhotnikov

Proceedings Volume 7822, 782209 (2011) https://doi.org/10.1117/12.884968

KEYWORDS: Mode locking, Semiconductor lasers, Semiconductors, Disk lasers, Quantum wells, Mirrors, Fabry–Perot interferometers, Diamond, Optical pumping, Optical semiconductors

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Proceedings Article | 22 February 2011 Paper

Paper

Tailoring the wavelength of semiconductor disk lasers

Oleg Okhotnikov

Proceedings Volume 7919, 79190U (2011) https://doi.org/10.1117/12.873167

KEYWORDS: Mirrors, Disk lasers, Semiconductor lasers, Semiconductors, Semiconducting wafers, Mode locking, Diamond, Gallium arsenide, Wafer-level optics, Optical semiconductors

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Proceedings Article | 22 February 2011 Paper

Paper

Multi-watt orange light generation by intracavity frequency doubling in a dual-gain quantum dot semiconductor disk laser

J. Rautiainen, I. Krestnikov, J. Nikkinen, O. Okhotnikov

Proceedings Volume 7917, 791702 (2011) https://doi.org/10.1117/12.873166

KEYWORDS: Mirrors, Reflectivity, Quantum dots, Semiconductor lasers, Disk lasers, Semiconductors, Second-harmonic generation, Output couplers, Nonlinear crystals, Frequency conversion

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Proceedings Article | 22 February 2011 Paper

Paper

Parabolic pulse generation in the nonlinear nonuniform fibre cascade

Igor Zolotovsky, Marina Yavtushenko, Alexej Sysoliatin, Dmitry Sementsov, Igor Yavtushenko, Oleg Okhotnikov

Proceedings Volume 7917, 79171T (2011) https://doi.org/10.1117/12.874611

KEYWORDS: Dispersion, Frequency modulation, Fermium, Optical fibers, Fiber amplifiers, Refractive index, Diffraction gratings, Wave propagation, Raman scattering, Optical amplifiers

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Proceedings Article | 11 February 2011 Paper

Paper

Actively Q-switched ytterbium tapered fiber laser

Valery Filippov, Juho Kerttula, Yuri Chamorovskii, Konstantin Golant, Oleg Okhotnikov

Proceedings Volume 7914, 79141Y (2011) https://doi.org/10.1117/12.871937

KEYWORDS: Q switched lasers, Pulsed laser operation, Fiber lasers, Bragg cells, Vignetting, Ytterbium, Laser scattering, Scattering, Optical filters, Q switched fiber lasers

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Proceedings Article | 11 February 2011 Paper

Paper

High power optically pumped VECSELs emitting in 1310-nm and 1550-nm bands

A. Sirbu, A. Mereuta, A. Caliman, N. Volet, Q. Zhu, V. Iakovlev, J. Rautiainen, J. Lyytikainen, O. Okhotnikov, J. Walczak, M. Wasiak, T. Czyszanowski, E. Kapon

Proceedings Volume 7919, 791903 (2011) https://doi.org/10.1117/12.874838

KEYWORDS: Mirrors, Quantum wells, Diamond, Semiconducting wafers, Gallium arsenide, Optical pumping, Oxygen, Refractive index, Wafer-level optics

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Proceedings Article | 17 February 2010 Paper

Paper

750-W double-clad ytterbium tapered fiber laser with nearly theoretically limited efficiency

Valery Filippov, Yuri Chamorovskii, Juho Kerttula, Konstantin Golant, Oleg Okhotnikov

Proceedings Volume 7580, 758017 (2010) https://doi.org/10.1117/12.841239

KEYWORDS: Absorption, Fiber lasers, Cladding, Vignetting, Ytterbium, Waveguides, Beam shaping, Fiber amplifiers, Optical amplifiers, Optical fibers

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Proceedings Article | 17 February 2010 Paper

Paper

Chirped pulse shaping via fiber dispersion modulation

M. Yavtushenko, I. Zolotovskii, O. Okhotnikov, A. Sysoliatin

Proceedings Volume 7580, 75802A (2010) https://doi.org/10.1117/12.841323

KEYWORDS: Dispersion, Solitons, Frequency modulation, Fermium, Modulation, Pulse shaping, Optical solitons, Single mode fibers, Fiber lasers, Fiber optics

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Proceedings Article | 5 October 2009 Paper

Paper

Highly birefringent suspended-core microstructured fibre for sensing application

Yu. Chamorovskiy, V. Gubin, S. Morshnev, S. Nikitov, O. Okhotnikov, M. Ryabko, N. Starostin, I. Vorob'ev

Proceedings Volume 7503, 750361 (2009) https://doi.org/10.1117/12.833593

KEYWORDS: Birefringence, Micro optical fluidics, Optical fibers, Polarization, Structured optical fibers, Gyroscopes, Transformers, Magneto-optics, Sensors, Fiber optics sensors

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Proceedings Article | 19 May 2009 Paper

Paper

Highly nonlinear GaSb-based saturable absorber mirrors

R. Koskinen, S. Suomalainen, J. Paajaste, S. Kivistö, M. Guina, O. Okhotnikov, M. Pessa

Proceedings Volume 7354, 73540G (2009) https://doi.org/10.1117/12.820690

KEYWORDS: Quantum wells, Gallium antimonide, Reflectivity, Mirrors, Modulation, Fiber lasers, Q switching, Semiconductors, Q switched fiber lasers, Q switches

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Proceedings Article | 18 May 2009 Paper

Paper

Wafer fused InP-GaAs optically pumped semiconductor disk laser operating at 1.57 um

Jari Lyytikäinen, Jussi Rautiainen, Alexei Sirbu, Alexandru Mereuta, Andrei Caliman, Eli Kapon, Oleg Okhotnikov

Proceedings Volume 7355, 73550C (2009) https://doi.org/10.1117/12.820672

KEYWORDS: Disk lasers, Semiconducting wafers, Semiconductor lasers, Semiconductors, Optical pumping, Mirrors, Optical semiconductors, Quantum wells, Gallium arsenide, Wafer-level optics

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Proceedings Article | 28 February 2009 Paper

Paper

1220 nm mode-locked GaInNAs disk laser

Mircea Guina, Jussi Rautiainen, Ville-Markus Korpijärvi, Janne Puustinen, Oleg Okhotnikov

Proceedings Volume 7193, 719316 (2009) https://doi.org/10.1117/12.810555

KEYWORDS: Mirrors, Quantum wells, Mode locking, Nitrogen, Disk lasers, Semiconductors, Gallium arsenide, Semiconductor lasers, Reflectivity, Diamond

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Proceedings Article | 28 February 2009 Paper

Paper

GaSb-based compounds tailored for MID-IR disk lasers

M. Guina, A. Härkönen, S. Suomalinen, J. Paajaste, R. Koskinen, M. Pessa, O. Okhotnikov

Proceedings Volume 7193, 71931F (2009) https://doi.org/10.1117/12.816221

KEYWORDS: Mirrors, Quantum wells, Disk lasers, Gallium antimonide, Semiconductor lasers, Semiconductors, Mode locking, Heterojunctions, Diamond, Mid-IR

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Proceedings Article | 19 February 2009 Paper

Paper

High-power single-mode tapered double-clad ytterbium fiber laser pumped by diode-laser bar

V. Filippov, Y. Chamorovskii, J. Kerttula, A. Kholodkov, O. Okhotnikov

Proceedings Volume 7195, 719506 (2009) https://doi.org/10.1117/12.807808

KEYWORDS: Absorption, Vignetting, Fiber lasers, Cladding, Ytterbium, Beam shaping, Solids, Geometrical optics, Fiber amplifiers, Refraction

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Proceedings Article | 8 May 2008 Paper

Paper

3.5 W GaInNAs disk laser operating at 1220 nm

Mircea Guina, Ville-Markus Korpijärvi, Jussi Rautiainen, Pietari Tuomisto, Janne Puustinen, Antti Härkönen, Oleg Okhotnikov

Proceedings Volume 6997, 69970Q (2008) https://doi.org/10.1117/12.780953

KEYWORDS: Mirrors, Quantum wells, Nitrogen, Disk lasers, Semiconductor lasers, Plasma, Semiconductors, Output couplers, Gallium arsenide, Reflectivity

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Proceedings Article | 16 April 2008 Paper

Paper

8-ns Q-switched fiber laser using resonant saturable absorber mirror

Tommi Hakulinen, Oleg Okhotnikov

Proceedings Volume 6998, 699803 (2008) https://doi.org/10.1117/12.779960

KEYWORDS: Modulation, Mirrors, Fiber lasers, Q switched lasers, Q switched fiber lasers, Q switching, Absorption, Semiconductors, Reflectivity, Pulsed laser operation

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Proceedings Article | 16 April 2008 Paper

Paper

2 watt 2 µm Tm/Ho fiber laser system passively Q-switched by antimonide semiconductor saturable absorber

Samuli Kivistö, Tommi Hakulinen, Mircea Guina, Karl Rößner, Alfred Forchel, Oleg Okhotnikov

Proceedings Volume 6998, 69980Q (2008) https://doi.org/10.1117/12.780487

KEYWORDS: Oscillators, Fiber lasers, Q switches, Semiconductors, Q switched lasers, Pulsed laser operation, Fiber amplifiers, Optical amplifiers, Reflectivity, Mirrors

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Proceedings Article | 25 February 2008 Paper

Paper

High-repetition rate mode-locked ytterbium fiber laser using dichroic fiber mirrors and photonic bandgap fiber technology

Lasse Orsila, Robert Herda, Oleg Okhotnikov

Proceedings Volume 6873, 68731N (2008) https://doi.org/10.1117/12.775198

KEYWORDS: Fiber lasers, Mirrors, Mode locking, Ytterbium, Dispersion, Fiber coatings, Reflectivity, Thin film coatings, Laser resonators, Zirconium dioxide

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Proceedings Article | 14 February 2008 Paper

Paper

Comparison of thermal management techniques for semiconductor disk lasers

S. Giet, A. Kemp, D. Burns, S. Calvez, M. Dawson, S. Suomalainen, A. Harkonen, M. Guina, O. Okhotnikov, M. Pessa

Proceedings Volume 6871, 687115 (2008) https://doi.org/10.1117/12.761616

KEYWORDS: Semiconductors, Diamond, Resistance, Silicon carbide, Semiconductor lasers, Disk lasers, Output couplers, Quantum wells, Heatsinks, Temperature metrology

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Proceedings Article | 14 February 2008 Paper

Paper

1-W red light generation by intracavity doubling in a 1240 nm GaInNAs semiconductor disk laser

Jussi Rautiainen, Antti Härkönen, Pietari Tuomisto, Janne Konttinen, Lasse Orsila, Mircea Guina, Oleg Okhotnikov

Proceedings Volume 6871, 68711A (2008) https://doi.org/10.1117/12.762857

KEYWORDS: Mirrors, Semiconductor lasers, Disk lasers, Semiconductors, Quantum wells, Second-harmonic generation, Crystals, Frequency conversion, Reflectivity, Diamond

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Proceedings Article | 8 May 2007 Paper

Paper

Flat-top temperature tuning response in periodically-poled nonlinear crystals

Huw Major, Anna Peacock, Carl Farrell, Corin B. Gawith, Peter G. Smith, Matei Rusu, Mircea Guina, Oleg Okhotnikov

Proceedings Volume 6582, 65820S (2007) https://doi.org/10.1117/12.722937

KEYWORDS: Crystals, Second-harmonic generation, Optical design, Nonlinear crystals, Packaging, Temperature metrology, Laser crystals, Lithium niobate, RGB color model, Fourier transforms

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Proceedings Article | 9 March 2007 Paper

Paper

Advances in power scalable, tunable, and mode-locked semiconductor disk lasers

O. Okhotnikov, Antti Härkönen, E. Saarinen, J. Rautiainen, R. Herda, M. Guina

Proceedings Volume 6451, 64510B (2007) https://doi.org/10.1117/12.723847

KEYWORDS: Mode locking, Semiconductor lasers, Semiconductors, Disk lasers, Mirrors, Laser resonators, Optical filters, Laser optics, Optical pumping, Quantum wells

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Proceedings Article | 20 February 2007 Paper

Paper

Semiconductor saturable absorbers with recovery time controlled by lattice mismatch

Mircea Guina, Soile Suomalainen, Tommi Hakulinen, Oleg Okhotnikov, Saulius Marcinkevicius

Proceedings Volume 6469, 64690P (2007) https://doi.org/10.1117/12.700273

KEYWORDS: Gallium arsenide, Indium gallium phosphide, Picosecond phenomena, Absorption, Mode locking, Quantum wells, Fiber lasers, Semiconductors, Mirrors, Luminescence

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Proceedings Article | 20 February 2007 Paper

Paper

Semiconductor saturable absorbers with recovery time controlled through growth conditions

Mircea Guina, Pietari Tuomisto, Oleg Okhotnikov, Saulius Marcinkevicius, Kenichiro Mizohata, Juhani Keinonen

Proceedings Volume 6451, 645113 (2007) https://doi.org/10.1117/12.725397

KEYWORDS: Semiconductors, Quantum wells, Ions, Picosecond phenomena, Absorption, Gallium arsenide, Mode locking, Plasma, Fiber lasers, Mirrors

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Proceedings Article | 20 April 2006 Paper

Paper

Characterization and operation of a broadband all-optical vertical cavity semiconductor wavelength converter

Claudio Porzi, Luca Poti, Antonella Bogoni, Mircea Guina, Oleg Okhotnikov

Proceedings Volume 6183, 61830Z (2006) https://doi.org/10.1117/12.663401

KEYWORDS: Data conversion, Reflectivity, Absorption, Quantum wells, Semiconductors, Fabry–Perot interferometers, Optical amplifiers, Signal attenuation, Switches, Signal processing

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Proceedings Article | 19 April 2006 Paper

Paper

Terahertz time-domain spectroscopy and spectrochronography of amino acids and polypeptides

N. Brandt, A. Yu. Chikishev, M. Nazarov, O. Okhotnikov, O. Parashchuk, S. Shkelnyuk, D. Sapozhnikov, I. Smirnova, A. Shkurinov

Proceedings Volume 6194, 619408 (2006) https://doi.org/10.1117/12.662491

KEYWORDS: Raman spectroscopy, Terahertz radiation, Bridges, Molecules, Proteins, Spectroscopy, Terahertz spectroscopy, Absorption, Fourier transforms, Electrons

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Proceedings Article | 28 February 2006 Paper

Paper

All-optical wavelength conversion in a vertical cavity semiconductor switch

Claudio Porzi, Luca Poti, Antonella Bogoni, Mircea Guina, Oleg Okhotnikov

Proceedings Volume 6116, 61160P (2006) https://doi.org/10.1117/12.654385

KEYWORDS: Data conversion, Reflectivity, Absorption, Quantum wells, Switches, Semiconductors, Fabry–Perot interferometers, Optical amplifiers, Signal attenuation, Signal processing

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Proceedings Article | 12 October 2005 Paper

Paper

Self-starting mode-locked fiber laser using biased semiconductor absorber mirror

A. Isomäki, A. Vainionpää, S. Suomalainen, O. Okhotnikov

Proceedings Volume 5958, 59580R (2005) https://doi.org/10.1117/12.622869

KEYWORDS: Mode locking, Mirrors, Fiber lasers, Semiconductors, Semiconductor lasers, Absorption, Picosecond phenomena, Reflectors, Mirror structures

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Proceedings Article | 23 September 2005 Paper

Paper

Ultrafast fiber lasers for homeland security

O. Okhotnikov

Proceedings Volume 5954, 59540B (2005) https://doi.org/10.1117/12.622168

KEYWORDS: Fiber lasers, Mode locking, Mirrors, Modulation, Reflectivity, Absorption, Pulsed laser operation, Terahertz radiation, Ultrafast phenomena, Semiconductors

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Detecting weapons concealed underneath clothing, analyzing the contents of suspicious-looking envelopes, or even spotting the onset of cancer: these are just some of the exciting prospects that have been turning terahertz wave research into one of the most important topics in photonics. Most broadband pulsed THz sources are based on the excitation of different materials with ultrashort laser pulses. So far, generation of tunable narrow-band THz radiation has been demonstrated using ultrafast solid state lasers as a source of high-intensity optical pulses. The lack of a high-power, low-cost, portable room-temperature THz source is the most significant limitation of modern THz systems. Advances in fiber laser technology can be used to further the capabilities of the homeland security. Using semiconductor saturable absorber mirrors allows for reliable mode-locked operation with different values of cavity dispersion in a broad spectrum ranged from 900 to 1600 nm. Semiconductor saturable absorbers mirrors have been used successfully to initiate and to sustain mode-locking in a wide range of core-pumped fiber lasers. The main advantage of the semiconductor saturable absorber mirrors (SESAM) is the possibility to control important parameters such as absorption recovery time, saturation fluence and modulation depth through the device design, growth conditions and post-growth processing. The SESAM as a cavity mirror in the fiber laser results in compact size, environmentally stable and simple ultrashort pulse lasers that can cover wide wavelength range and generate optical pulses with durations from picoseconds to femtoseconds. Employing SESAM technology for mode-locking, the double-clad fiber laser promises superior pulse quality, high stability and pulse energy without need for power booster that eventually degrades the pulse quality due to nonlinear distortions in the amplifier fiber. We give an overview of recent achievements in ultrafast fiber lasers; discuss basic properties, technical challenges and methods to achieve stable short pulse operation with high average and peak powers from all-fiber devices. The important aspects of the mode-locked fiber lasers relevant to practical security systems are presented. Particularly, the effect of the amplified spontaneous emission (ASE) on the performance of the SESAMs in mode-locked fiber lasers has been investigated. We show that high level of ASE intensity typical for fiber lasers can saturate the absorption and degrade significantly the nonlinear response of the SESAM. We studied the effect of the absorber recovery time and demonstrated that the ion-irradiated SESAMs with fast nonlinear response are less affected by the ASE radiation and, consequently, in the presence of the high-power ASE they exhibit better self-starting capability compared with slow absorbers. The promising method for noise suppression based on the cavity-enhanced optical limiting is another important issue described. Optical limiting and saturable absorption are studied by placing two-photon absorption material and InGaAs quantum wells in a microcavity. We show that field enhancement that occurs in a cavity affects strongly the limiting threshold and dynamic range of roll-over in the nonlinear response. To achieve energy levels sufficient for different security systems, power scaling technique should be employed. We present a stretched-pulse double-clad ytterbium-doped fiber laser mode-locked with SESAM. High modulation depth in the nonlinear response of the SESAM allows for self-starting pulse operation without any dispersion compensation in the laser cavity. The chirp on the output pulses is highly linear and can be compensated for with dispersion in photonic bandgap fiber. The results is a fully self-starting source of 150-fs pulse with 63-nJ of energy at a 8-MHz repetition rate.

Proceedings Article | 1 September 2004 Paper

Paper

980-nm picosecond ytterbium fiber laser

Suvi Karirinne, Janne Konttinen, Tomi Jouhti, Anatoly Grudinin, Oleg Okhotnikov

Proceedings Volume 5460, (2004) https://doi.org/10.1117/12.545068

KEYWORDS: Fiber lasers, Mode locking, Picosecond phenomena, Ytterbium, Mirrors, Second-harmonic generation, Semiconductor lasers, Solitons, Semiconductors, Femtosecond phenomena

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Proceedings Article | 1 September 2004 Paper

Paper

Dispersion compensation-free fiber laser mode-locked and stabilized by a high-contrast saturable absorber mirror

Robert Herda, Oleg Okhotnikov

Proceedings Volume 5460, (2004) https://doi.org/10.1117/12.545569

KEYWORDS: Mode locking, Mirrors, Fiber lasers, Picosecond phenomena, Dispersion, Pulsed laser operation, Reflectivity, Semiconductors, Gallium arsenide

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Proceedings Article | 1 September 2004 Paper

Paper

Femtosecond neodymium-doped fiber laser operating in the 894- to 909-nm spectral range

Matei Rusu, Suvi Karirinne, Mircea Guina, Anatoly Grudinin, Oleg Okhotnikov

Proceedings Volume 5460, (2004) https://doi.org/10.1117/12.545025

KEYWORDS: Mode locking, Fiber lasers, Mirrors, Dispersion, Ultrafast phenomena, Picosecond phenomena, Semiconductors, Solid state lasers, Gallium arsenide, Diffraction gratings

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Proceedings Article | 7 April 2004 Paper

Paper

Femtosecond Yb:KYW laser pumped by a single narrow-stripe laser diode

Alexander Lagatsky, Edward Rafailov, Christopher Leburn, Christian Brown, Ning Xiang, Oleg Okhotnikov, Wilson Sibbett

Proceedings Volume 5478, (2004) https://doi.org/10.1117/12.558357

KEYWORDS: Semiconductor lasers, Femtosecond phenomena, Mode locking, Laser damage threshold, Indium gallium arsenide, Semiconductors, Mirrors

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Proceedings Article | 30 September 2003 Paper

Paper

Practical method for fabrication dense WDM fiber couplers with arbitrary wavelength channels

Matei Rusu, Oleg Okhotnikov

Proceedings Volume 5227, (2003) https://doi.org/10.1117/12.520104

KEYWORDS: Wavelength division multiplexing, Dense wavelength division multiplexing, Fiber couplers, Cladding, Refractive index, Waveguides, Calibration, Single mode fibers, Optical amplifiers, Semiconductor lasers

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Proceedings Article | 30 September 2003 Paper

Paper

Mode-locked fiber lasers based on semiconductor saturable absorbers

Mircea Guina, O. Okhotnikov

Proceedings Volume 5227, (2003) https://doi.org/10.1117/12.520103

KEYWORDS: Mode locking, Modulation, Fiber lasers, Semiconductors, Semiconductor lasers, Reflectivity, Quantum wells, Pulsed laser operation, Mirrors, Ultrafast phenomena

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Conference Committee Involvement (3)

Vertical External Cavity Surface Emitting Lasers (VECSELs) II

23 January 2012 | San Francisco, California, United States

Vertical External Cavity Surface Emitting Lasers (VECSELs)

24 January 2011 | San Francisco, California, United States

Semiconductor Lasers and Laser Dynamics II

3 April 2006 | Strasbourg, France

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