Dr. Gregory J. Fetzer Profile

Dr. Gregory J. Fetzer

Deputy Division Director at Arete Associates

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Author

Publications (18)

Proceedings Article | 4 March 2022 Presentation + Paper

High-power, single-frequency intracavity doubled VECSEL at 589 nm for sodium guide stars

Gregory Fetzer, Juan Chilla, Steven Rako, Cory Baumgarten, Nathan Woody, Celine D'Orgeville

Proceedings Volume 11984, 1198407 (2022) https://doi.org/10.1117/12.2612400

KEYWORDS: Sodium, Spectroscopy, Cameras, Fabry–Perot interferometers, Sodium guide stars, Laser guide stars, Laser applications, Astronomy, Polarization, Optical filters

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Proceedings Article | 13 December 2020 Presentation + Paper

Australia’s first laser guide star: design and telescope integration at Mount Stromlo Observatory

Noelia Martinez, Céline d'Orgeville, David Ashworth, Michael Copeland, Antony Galla, Doris Grosse, Sowmya Hassan Krishna, Marcus Lingham, Ian Price, Tony Travouillon, Greg Fetzer, Steve Rako, Cory Baumgarten, James Webb, Mark Blundell, Yue Gao, Andrew Gray, Ian Ritchie, Craig Smith, Yanjie Wang, Olivia Byrd, Robert Johnson

Proceedings Volume 11448, 114481U (2020) https://doi.org/10.1117/12.2563374

KEYWORDS: Laser guide stars, Observatories, Telescopes, Adaptive optics, Semiconductor lasers, Imaging systems, Laser systems engineering, Laser development, Projection systems, Optical instrument design

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Proceedings Article | 2 March 2020 Presentation + Paper

High-power single-frequency intracavity doubled VECSEL at 589 nm for sodium guidestar

Steven Rako, Gregory Fetzer, Cory Baumgarten, . Sandalphon, Celine D’Orgeville, Steven Floyd, Lucas Hill, Nathan Woody, Jussi-Pekka Penttinen, Mircea Guina

Proceedings Volume 11263, 112630C (2020) https://doi.org/10.1117/12.2546357

KEYWORDS: Mirrors, Sodium, Sodium guide stars, Fabry–Perot interferometers, Laser guide stars, Astronomy, Crystals, Observatories, Laser stabilization, Diamond

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Proceedings Article | 10 July 2018 Presentation + Paper

Semiconductor guidestar laser for astronomy, space, and laser communications: prototype design and expected performance

Céline d'Orgeville, Gregory Fetzer, Steven Floyd, Luke Hill, Steve Rako, Nathan Woody, . Sandalphon, Francis Bennet, Antonin Bouchez, Yue Gao, Michael Goodwin, Andrew Lambert, James Mason, Francois Rigaut, Stuart Ryder, Daniel Shaddock, Robert Sharp

Proceedings Volume 10703, 107030T (2018) https://doi.org/10.1117/12.2312405

KEYWORDS: Semiconductor lasers, Laser guide stars, Semiconductors, Sodium, Prototyping, Laser applications, Laser development, Space telescopes, Adaptive optics, Astronomy

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Proceedings Article | 26 July 2016 Paper

Four generations of sodium guide star lasers for adaptive optics in astronomy and space situational awareness

Céline d'Orgeville, Gregory Fetzer

Proceedings Volume 9909, 99090R (2016) https://doi.org/10.1117/12.2234298

KEYWORDS: Laser applications, Laser guide stars, Sodium, Space telescopes, Laser development, Sodium guide stars, Semiconductor lasers, Adaptive optics, Telescopes, Fiber lasers

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This paper recalls the history of sodium guide star laser systems used in astronomy and space situational awareness adaptive optics, analyzing the impact that sodium laser technology evolution has had on routine telescope operations. While it would not be practical to describe every single sodium guide star laser system developed to date, it is possible to characterize their evolution in broad technology terms. The first generation of sodium lasers used dye laser technology to create the first sodium laser guide stars in Hawaii, California, and Spain in the late 1980s and 1990s. These experimental systems were turned into the first laser guide star facilities to equip mediumto- large diameter adaptive optics telescopes, opening a new era of Laser Guide Star Adaptive Optics (LGS AO)-enabled diffraction-limited imaging from the ground. Although they produced exciting scientific results, these laser guide star facilities were large, power-hungry and messy. In the USA, a second-generation of sodium lasers was developed in the 2000s that used cleaner, yet still large and complex, solid-state laser technology. These are the systems in routine operation at the 8 to 10m-class astronomical telescopes and 4m-class satellite imaging facilities today. Meanwhile in Europe, a third generation of sodium lasers was being developed using inherently compact and efficient fiber laser technology, and resulting in the only commercially available sodium guide star laser system to date. Fiber-based sodium lasers are being or will soon be deployed at three astronomical telescopes and two space surveillance stations. These highly promising systems are still relatively large to install on telescopes and they remain significantly expensive to procure and maintain. We are thus proposing to develop a fourth generation of sodium lasers: based on semiconductor technology, these lasers could provide a definitive solution to the problem of sodium LGS AO laser sources for all astronomy and space situational awareness applications.

Proceedings Article | 15 October 2013 Paper

Dust-penetrating (DUSPEN) see-through lidar for helicopter situational awareness in DVE

James Murray, Jason Seely, Jeff Plath, Eric Gotfredson, John Engel, Bill Ryder, Neil Van Lieu, Ron Goodwin, Tyler Wagner, Greg Fetzer, Nick Kridler, Chris Melancon, Ken Panici, Anthony Mitchell

Proceedings Volume 8897, 88970K (2013) https://doi.org/10.1117/12.2033921

KEYWORDS: LIDAR, Driver's vision enhancers, Sensors, Target detection, Visualization, Clouds, Imaging systems, Image sensors, Global Positioning System, 3D image processing

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Proceedings Article | 16 May 2013 Paper

Dust-Penetrating (DUSPEN) “see-through” lidar for helicopter situational awareness in DVE

James Murray, Jason Seely, Jeff Plath, Eric Gotfreson, John Engel, Bill Ryder, Neil Van Lieu, Ron Goodwin, Tyler Wagner, Greg Fetzer, Nick Kridler, Chris Melancon, Ken Panici, Anthony Mitchell

Proceedings Volume 8737, 87370H (2013) https://doi.org/10.1117/12.2016439

KEYWORDS: LIDAR, Driver's vision enhancers, Sensors, Target detection, Visualization, Clouds, Imaging systems, Image sensors, Global Positioning System, 3D image processing

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Proceedings Article | 18 February 2013 Paper

High power (23W) vertical external cavity surface emitting laser emitting at 1180 nm

T. Leinonen, S. Ranta, M. Tavast, R. Epstein, G. Fetzer, . Sandalphon, N. Van Lieu, M. Guina

Proceedings Volume 8606, 860604 (2013) https://doi.org/10.1117/12.2004904

KEYWORDS: Mirrors, Quantum wells, Optical filters, Laser resonators, Electronic filtering, High power lasers, Reflectivity, Diamond, Semiconductor lasers, Laser optics

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Proceedings Article | 28 April 2010 Paper

High-power narrow-linewidth optically pumped dilute nitride disk laser with emission at 589 nm

Tomi Leinonen, Antti Härkönen, Ville-Markus Korpijärvi, Mircea Guina, Ryan Epstein, James Murray, Gregory Fetzer

Proceedings Volume 7720, 772016 (2010) https://doi.org/10.1117/12.854747

KEYWORDS: Mirrors, Nonlinear crystals, Quantum wells, Crystals, Fabry–Perot interferometers, Semiconductor lasers, Disk lasers, Laser resonators, Reflectivity, Diamond

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Proceedings Article | 21 August 2003 Paper

Signal processing, image registration, and visualization of FLASH lidar data

Asher Gelbart, Shannon Bybee-Driscoll, Jonathan Freeman, Gregory Fetzer, Dave Wasson, Keith Hanna, Wen-Yi Zhao

Proceedings Volume 5086, (2003) https://doi.org/10.1117/12.501608

KEYWORDS: Sensors, LIDAR, Image registration, Imaging systems, Visualization, 3D image processing, Data processing, Image processing, Camouflage, Image sensors

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Proceedings Article | 21 August 2003 Paper

Identifying targets under trees: jigsaw 3D ladar test results

David Ludwig, Albert Kongable, Scott Krywick, H. Albrecht, G. Kamrath, Jerry Milam, David Brown, Gregory Fetzer, Keith Hanna

Proceedings Volume 5086, (2003) https://doi.org/10.1117/12.501594

KEYWORDS: Receivers, LIDAR, Sensors, Servomechanisms, Readout integrated circuits, Visualization, Data storage, Human-machine interfaces, Global Positioning System, Clouds

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Proceedings Article | 21 August 2003 Paper

FLASH lidar data collections in terrestrial and ocean environments

Asher Gelbart, Chris Weber, Shannon Bybee-Driscoll, Jonathan Freeman, Gregory Fetzer, Tom Seales, Karen McCarley, James Wright

Proceedings Volume 5086, (2003) https://doi.org/10.1117/12.501595

KEYWORDS: Sensors, LIDAR, Camouflage, Surf zone, Imaging systems, Signal to noise ratio, Pulsed laser operation, Receivers, Spatial resolution, Mining

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Proceedings Article | 1 July 2003 Paper

Midinfrared laser absorption spectroscopy in coiled hollow optical waveguides

Gregory Fetzer, Anthony Pittner, Philip Silkoff

Proceedings Volume 4957, (2003) https://doi.org/10.1117/12.485398

KEYWORDS: Waveguides, Absorption, Modulation, Inflammation, Sensors, Quantum cascade lasers, Digital signal processing, Hollow waveguides, Laser spectroscopy, Absorption spectroscopy

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Proceedings Article | 23 July 1999 Paper

Multipurpose underwater imaging and ranging camera for low-visibility mine countermeasure (MCM) missions

Anthony Gleckler, Gregory Fetzer

Proceedings Volume 3711, (1999) https://doi.org/10.1117/12.354649

KEYWORDS: Ranging, Cameras, Signal to noise ratio, Imaging systems, Transmitters, Mining, Receivers, Backscatter, Sensors, Laser range finders

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Proceedings Article | 26 November 1996 Paper

In-situ ammonia analyzer for process control and environmental monitoring

Garth Monlux, Joel Brand, Patrick Zmarzly, M. Walker, K. Groff, Gregory Fetzer, Neil Goldstein, Fritz Bien, Steven Richtsmeier, Jamine Lee

Proceedings Volume 2835, (1996) https://doi.org/10.1117/12.259776

KEYWORDS: Signal processing, Signal detection, Sensors, Process control, Semiconductor lasers, Absorption, Calibration, Gases, Temperature metrology, Environmental monitoring

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Proceedings Article | 21 October 1996 Paper

Tunable diode laser absorption spectroscopy of common combustion gases at elevated temperatures

Joel Brand, Gregory Fetzer, K. Groff, Garth Monlux, Patrick Zmarzly

Proceedings Volume 2834, (1996) https://doi.org/10.1117/12.255328

KEYWORDS: Absorption, Tunable diode lasers, Modulation, Gases, Absorption spectroscopy, Combustion, Temperature metrology, Data communications, Fiber optic communications, Semiconductor lasers

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Proceedings Article | 10 February 1995 Paper

Comparison of NH3 point monitoring and diode-laser-based path-integrated measurements

Neil Goldstein, Steven Richtsmeier, Jamine Lee, Fritz Bien, Gregory Fetzer, K. Groff

Proceedings Volume 2366, (1995) https://doi.org/10.1117/12.205589

KEYWORDS: Calibration, Absorption, Retroreflectors, Semiconductor lasers, Transceivers, Sensors, Process control, Chlorine, Environmental monitoring, Chemiluminescence

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Proceedings Article | 1 May 1990 Paper

Low-cost cw CO2 lidar system for low-level wind shear detection

Gregory Fetzer, Madison Post

Proceedings Volume 1222, (1990) https://doi.org/10.1117/12.18379

KEYWORDS: LIDAR, Wind measurement, Telescopes, Doppler effect, Sensors, Mirrors, Carbon dioxide, Receivers, Velocity measurements

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