Dr. Dennis R. Alexander Profile

Dr. Dennis R. Alexander

Director at Univ of Nebraska-Lincoln

SPIE Involvement:

Author

Publications (25)

Proceedings Article | 10 March 2021 Presentation + Paper

Multi-material, multi-layer femtosecond laser surface processing

Alfred Tsubaki, Mark Anderson, Andrew Reicks, Jeffrey Shield, Dennis Alexander, Craig Zuhlke

Proceedings Volume 11674, 116740B (2021) https://doi.org/10.1117/12.2582756

KEYWORDS: Femtosecond phenomena, Metals, Copper, Titanium, Surface properties, Silicon carbide, Semiconductors, Semiconductor materials, Pulsed laser operation, Materials processing

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Proceedings Article | 17 May 2019 Presentation + Paper

A new modality for the detection of chemical vapors using middle infrared femtosecond pulse propagation effects

William Conner Thomas, Craig Zuhlke, Dennis Alexander

Proceedings Volume 11010, 110100X (2019) https://doi.org/10.1117/12.2520793

KEYWORDS: Mid-IR, Data modeling, Principal component analysis, Infrared signatures, Atmospheric optics, Picosecond phenomena

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Proceedings Article | 4 March 2019 Presentation + Paper

Oxide layer reduction and formation of an aluminum nitride surface layer during femtosecond laser surface processing of aluminum in nitrogen-rich gases

Alfred Tsubaki, Edwin Peng, Mark Anderson, William Thomas, Jeffrey Shield, Craig Zuhlke, Dennis Alexander

Proceedings Volume 10906, 109060N (2019) https://doi.org/10.1117/12.2508812

KEYWORDS: Aluminum, Oxygen, Laser processing, Chemical analysis, Nitrogen, Aluminum nitride, Nanoparticles, Oxides, Femtosecond phenomena, Scanning electron microscopy

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Proceedings Article | 4 March 2019 Presentation + Paper

Femtosecond XFROG in the middle infrared: a novel approach to standoff detection

William Conner Thomas, Craig Zuhlke, Alfred Tsubaki, Dennis Alexander

Proceedings Volume 10903, 109030J (2019) https://doi.org/10.1117/12.2507460

KEYWORDS: Mid-IR, Data modeling, Four wave mixing, Femtosecond phenomena, Atmospheric propagation, Picosecond phenomena, Standoff detection

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Proceedings Article | 4 March 2019 Paper

Comparison of self-organized micro/nanostructure formation on copper using dual-pulse versus single-pulse femtosecond laser surface processing

Craig Zuhlke, Nick Roth, Aaron Ediger, Alfred Tsubaki, Edwin Peng, Mark Anderson, Corey Kruse, Jeffrey Shield, George Gogos, Dennis Alexander

Proceedings Volume 10906, 109060Q (2019) https://doi.org/10.1117/12.2507285

KEYWORDS: Copper, Scanning electron microscopy, Femtosecond phenomena, Metals, Polarizers, Picosecond phenomena, Laser processing, Pulsed laser operation, Nanoparticles

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Proceedings Article | 12 March 2015 Paper

Enhancing vapor generation at a liquid-solid interface using micro/nanoscale surface structures fabricated by femtosecond laser surface processing

Troy Anderson, Chris Wilson, Craig Zuhlke, Corey Kruse, George Gogos, Sidy Ndao, Dennis Alexander

Proceedings Volume 9351, 93510D (2015) https://doi.org/10.1117/12.2079828

KEYWORDS: Electrodes, Surface finishing, Hydrogen, Femtosecond phenomena, Plasma, Resistance, Polishing, Interfaces, Pulsed laser operation, Scanning electron microscopy

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Proceedings Article | 12 March 2015 Paper

Superhydrophobic metallic surfaces functionalized via femtosecond laser surface processing for long term air film retention when submerged in liquid

Craig Zuhlke, Troy Anderson, Pengbo Li, Michael Lucis, Nick Roth, Jeffrey Shield, Benjamin Terry, Dennis Alexander

Proceedings Volume 9351, 93510J (2015) https://doi.org/10.1117/12.2079164

KEYWORDS: Titanium, Stomach, Liquids, Femtosecond phenomena, Scanning electron microscopy, Nanoparticles, Laser ablation, Carbon, Chemistry, Oxidation

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Proceedings Article | 6 March 2014 Paper

Tailoring liquid/solid interfacial energy transfer: fabrication and application of multiscale metallic surfaces with engineered heat transfer and electrolysis properties via femtosecond laser surface processing techniques

Troy Anderson, Chris Wilson, Craig Zuhlke, Corey Kruse, Anton Hassebrook, Isra Somanas, Sidy Ndao, George Gogos, Dennis Alexander

Proceedings Volume 8968, 89680R (2014) https://doi.org/10.1117/12.2040615

KEYWORDS: Electrodes, Energy transfer, Femtosecond phenomena, Hydrogen, Scanning electron microscopy, Fabrication, Interfaces, Thermal engineering, Liquids, Nanoparticles

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Proceedings Article | 6 March 2014 Paper

Understanding the formation of self-organized micro/nanostructures on metal surfaces from femtosecond laser ablation using stop-motion SEM imaging

Craig Zuhlke, Troy Anderson, Dennis Alexander

Proceedings Volume 8968, 89680C (2014) https://doi.org/10.1117/12.2040348

KEYWORDS: Scanning electron microscopy, Nickel, Video, Femtosecond phenomena, Laser ablation, Surface finishing, Nanostructures, Metals, Physics, Electron microscopes

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Proceedings Article | 14 November 2013 Paper

Understanding the physical and material dynamics of multipulse femtosecond laser interactions with surfaces

Troy Anderson, Craig Zuhlke, Chris Wilson, Corey Kruse, Natale Ianno, Sidy Ndao, George Gogos, Dennis Alexander

Proceedings Volume 8885, 888518 (2013) https://doi.org/10.1117/12.2030319

KEYWORDS: Laser ablation, Laser induced damage, Femtosecond phenomena, Nickel, Pulsed laser operation, Statistical analysis, Laser applications, Laser processing, Scanning electron microscopy, Laser energy

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Proceedings Article | 18 May 2012 Paper

Fiber-optic Raman probe based on single-crystal sapphire fiber

Tongqing Liu, Ming Han, Cody Raml, Dennis Alexander, Xiangnan He, Yongfeng Lu

Proceedings Volume 8374, 83740P (2012) https://doi.org/10.1117/12.920780

KEYWORDS: Raman spectroscopy, Sapphire, Optical fibers, Fiber lasers, Signal detection, Calcite, Silicon, Fiber optics, Silica, Crystals

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Proceedings Article | 16 October 2006 Paper

Optical communications with femtosecond lasers

Jianchao Li, Haifeng Zhang, David Doerr, Dennis Alexander

Proceedings Volume 6399, 639908 (2006) https://doi.org/10.1117/12.690618

KEYWORDS: Aerosols, Polarization, Femtosecond phenomena, Silica, Mode locking, Beam splitters, Atmospheric particles, Pulsed laser operation, Clouds, Continuous wave operation

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Proceedings Article | 21 January 2006 Paper

Experimental observation of diffraction of ultrashort laser pulses by a single slit

Haifeng Zhang, Jianchao Li, Dennis Alexander, Dave Doerr, Nageswara Rao Tadepalli

Proceedings Volume 6103, 610318 (2006) https://doi.org/10.1117/12.648298

KEYWORDS: Diffraction, Pulsed laser operation, Ultrafast phenomena, Continuous wave operation, Femtosecond phenomena, Optical simulations, Near field diffraction, Near field optics, Silica

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Proceedings Article | 12 April 2005 Paper

Monitoring steam laser cleaning using optical probe techniques

Nagaraj Batta, Yongfeng Lu, Xinwei Wang, Jing Shi, Daniel Thompson, David Doerr, Dennis Alexander

Proceedings Volume 5713, (2005) https://doi.org/10.1117/12.593956

KEYWORDS: Silicon, Particles, Excimer lasers, Toxic industrial chemicals, Aluminum, Thin films, FT-IR spectroscopy, Semiconductor lasers, Silicon carbide, Nitrogen

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Proceedings Article | 13 September 2002 Paper

Femtosecond laser drilling of high-aspect-ratio 1-micron holes in silicon

Dennis Alexander, B. Mihulka, David Doerr

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482107

KEYWORDS: Femtosecond phenomena, Silicon, Scanning electron microscopy, Particles, Laser drilling, Semiconductor lasers, Metals, Laser ablation, Plasma, Laser systems engineering

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Proceedings Article | 30 August 1999 Paper

Submicron patterning of aluminum films by laser ablation

David Doerr, Dennis Alexander

Proceedings Volume 3874, (1999) https://doi.org/10.1117/12.361248

KEYWORDS: Laser ablation, Picosecond phenomena, Aluminum, Femtosecond phenomena, Atomic force microscopy, Optical lithography, Microfabrication, Silica, Amplifiers, Metals

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Proceedings Article | 4 September 1998 Paper

Detection and location of buried objects using active thermal sensing

Dana Poulain, Scott Schaub, Dennis Alexander, Joseph Krause

Proceedings Volume 3392, (1998) https://doi.org/10.1117/12.324255

KEYWORDS: Infrared imaging, Thermography, Land mines, Target detection, Infrared cameras, Thermal sensing, Carbon dioxide lasers, Infrared radiation, Copper, Infrared sensors

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Proceedings Article | 23 July 1997 Paper

Chemical aerosol detection using femtosecond laser pulses

Dennis Alexander, Mark Rohlfs, John Stauffer

Proceedings Volume 3082, (1997) https://doi.org/10.1117/12.280931

KEYWORDS: Optical spheres, Femtosecond phenomena, Aerosols, Diffraction, Imaging systems, Scattering, Dielectrics, Laser scattering, Atmospheric modeling, Pulsed laser operation

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SPIE Journal Paper | 1 March 1995

Complex index-of-refraction measurements for RP-1 liquid rocket fuel

Dennis Alexander, Ramu Kalwala, Robert Kubik, Scott Schaub

OE, Vol. 34, Issue 03, (March 1995) https://doi.org/10.1117/12.10.1117/12.190448

KEYWORDS: Liquids, Refractive index, Reflectivity, Rockets, Refraction, Water, Sensors, Mirrors, Argon, Ions

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Proceedings Article | 18 March 1994 Paper

Real and imaginary index-of-refraction measurements for RP-1 rocket fuel

Dennis Alexander, Robert Kubik, Ramu Kalwala, John Barton

Proceedings Volume 2122, (1994) https://doi.org/10.1117/12.171288

KEYWORDS: Liquids, Refractive index, Reflectivity, Michelson interferometers, Water, Mirrors, Rockets, Refraction, Sensors, Spectrophotometry

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Proceedings Article | 24 May 1993 Paper

Modeling of a high-energy laser pulse focused within an aerosol spray

John Barton, Pratap Cheekati, Dennis Alexander, Larry Liou

Proceedings Volume 1862, (1993) https://doi.org/10.1117/12.145704

KEYWORDS: Aerosols, Pulsed laser operation, Software, Liquids, Laser scattering, Absorption, Light scattering, Scattering, Atmospheric modeling, Laser energy

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