Dr. Richard K. DeFreez Profile

Dr. Richard K. DeFreez

SPIE Involvement:

Author

Proceedings Article | 17 September 2009 Paper

LIF bio-aerosol threat triggers: then and now

Richard DeFreez

Proceedings Volume 7484, 74840H (2009) https://doi.org/10.1117/12.835088

KEYWORDS: Laser induced fluorescence, Luminescence, Atmospheric particles, Sensors, Aerosols, Particles, Deep ultraviolet, Ultraviolet radiation, Semiconductor lasers, Fluorescence spectroscopy

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Proceedings Article | 28 October 2005 Paper

Design considerations and performance characteristics of AirSentinel: a new UV-LIF bio-aerosol threat detection trigger

Richard DeFreez, Ezra Merrill, Sam Albanna, Bert Davis, Charles Call

Proceedings Volume 5990, 59900O (2005) https://doi.org/10.1117/12.634389

KEYWORDS: Atmospheric particles, Aerosols, Luminescence, Light emitting diodes, Sensors, Particles, Ultraviolet radiation, Ultraviolet light emitting diodes, Laser induced fluorescence, Buildings

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Proceedings Article | 29 December 2004 Paper

Multispectral-diode-laser-induced fluorescence biological particle sensor

Geoffrey Wilson, Richard DeFreez

Proceedings Volume 5617, (2004) https://doi.org/10.1117/12.578854

KEYWORDS: Sensors, Luminescence, Semiconductor lasers, Laser induced fluorescence, Particles, Ultraviolet radiation, Pathogens, Atmospheric particles, Optical fabrication, Solar concentrators

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Proceedings Article | 13 August 2004 Paper

Improving diode-laser-induced fluorescence detection of airborne biological particles by exciting multiple biofluorophores

Geoffrey Wilson, Richard DeFreez

Proceedings Volume 5416, (2004) https://doi.org/10.1117/12.543248

KEYWORDS: Particles, Atmospheric particles, Luminescence, Sensors, Photodetectors, Semiconductor lasers, Laser induced fluorescence, Pathogens, Fluorescence spectroscopy, Ultraviolet radiation

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Proceedings Article | 22 September 2003 Paper

Autofluorescence detection using UV diode laser simultaneous excitation of multiple wavelengths

Geoffrey Wilson, Richard DeFreez

Proceedings Volume 5071, (2003) https://doi.org/10.1117/12.500865

KEYWORDS: Aerosols, Luminescence, Sensors, Ultraviolet radiation, Semiconductor lasers, Atmospheric particles, Pathogens, Signal detection, Fluorescence spectroscopy, Stray light

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Proceedings Article | 22 February 2002 Paper

Fluorescence particle detector for real-time quantification of viable organisms in air

Greg Luoma, Pierre Cherrier, Marc Piccioni, Carol Tanton, Steve Herz, Richard DeFreez, Michael Potter, Kenneth Girvin, Ronald Whitney

Proceedings Volume 4576, (2002) https://doi.org/10.1117/12.456967

KEYWORDS: Organisms, Particles, Sensors, Luminescence, Atmospheric particles, Aerosols, Biological detection systems, Biological weapons, Ultraviolet radiation, Contamination

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Proceedings Article | 2 May 1997 Paper

Performance of ridge-guide AlGaInAs lasers

Jieh-Ping Sih, T. Chou, Jay Kirk, Jerome Butler, Gary Evans, A. Mantie, Jack Koscinski, Richard DeFreez

Proceedings Volume 3001, (1997) https://doi.org/10.1117/12.273791

KEYWORDS: Laser damage threshold, Quantum wells, Etching, Modulation, Semiconductor lasers, Internal quantum efficiency, Semiconducting wafers, Switching, Quantum efficiency, Diodes

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Proceedings Article | 19 June 1995 Paper

Grating theory for feedback and outcoupling of quantum well laser structures

Jin Liu, Jerome Butler, Gary Evans, Richard DeFreez

Proceedings Volume 2399, (1995) https://doi.org/10.1117/12.212484

KEYWORDS: Waveguides, Wave propagation, Reflection, Radio propagation, Dielectrics, Teeth, Quantum wells, Numerical analysis, Signal attenuation, Electromagnetism

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Proceedings Article | 24 April 1995 Paper

Dynamics of ridge-guide strained-layer multiple quantum well 1.3- and 1.55-um semiconductor lasers

Gary Evans, Jay Kirk, Jieh-Ping Sih, T. Chou, Jerome Butler, Richard DeFreez, A. Mantie, K. Ouyang, A. Ceruzzi

Proceedings Volume 2397, (1995) https://doi.org/10.1117/12.206919

KEYWORDS: Fiber lasers, Semiconductor lasers, Quantum wells, Laser resonators, Resonators, Diffusion, Electrical engineering, Electronics, Laser development, Etching

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Proceedings Article | 10 June 1994 Paper

High-speed modulation of twin-emitter semiconductor laser arrays

Marc Felisky, Richard DeFreez, Nils Carlson, Herbert Winful

Proceedings Volume 2155, (1994) https://doi.org/10.1117/12.177395

KEYWORDS: Modulation, Semiconductor lasers, Optical components, Microwave radiation, Picosecond phenomena, Computer programming, Detection theory, Binary data, Laser systems engineering, Signal analysis

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Proceedings Article | 16 June 1993 Paper

High-brightness unstable resonator semiconductor lasers

Richard DeFreez, Zhuoyu Bao, P. Carleson, Marc Felisky, Craig Largent

Proceedings Volume 1850, (1993) https://doi.org/10.1117/12.146934

KEYWORDS: Semiconductor lasers, Mirrors, Resonators, Quantum wells, Fabry–Perot interferometers, Micromachining, Continuous wave operation, Pulsed laser operation, Laser damage threshold, Technologies and applications

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Showing 5 of 11 publications

Conference Committee Involvement (5)

Optically Based Biological and Chemical Detection for Defence V

1 September 2009 | Berlin, Germany

Optically Based Biological and Chemical Detection for Defence IV

16 September 2008 | Cardiff, Wales, United Kingdom

Optically Based Biological and Chemical Detection for Defence

18 September 2007 | Florence, Italy

Optically-Based Biological and Chemical Detection for Defence III

11 September 2006 | Stockholm, Sweden

Optically Based Biological and Chemical Sensing for Defence

25 October 2004 | London, United Kingdom

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