Dr. Robert G. Bedford Profile

Dr. Robert G. Bedford

Principal Researcher at Air Force Research Lab

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (22)

Proceedings Article | 13 March 2024 Presentation + Paper

Higher diffraction orders and manufacturing defects in large metalenses

Matthew Ferguson, Ekaterina Poutrina, Joel Leger, Piyush Shah, Robert Bedford, Augustine Urbas, Jannick Rolland

Proceedings Volume 12897, 128970E (2024) https://doi.org/10.1117/12.3001582

KEYWORDS: Diffraction, Semiconducting wafers, Manufacturing, Lenses, Metalenses, Scanning electron microscopy, Wafer level optics, Design, Silicon, Mid infrared

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Proceedings Article | 12 March 2024 Presentation + Paper

Infrared vertical external cavity surface emitting laser threshold quantum magnetometer

Nathan Gottesman, Michael Slocum, Gary Sevison, Michael Wolf, Michal Lukowski, Chris Hessenius, Mahmoud Fallahi, Robert Bedford

Proceedings Volume 12868, 1286806 (2024) https://doi.org/10.1117/12.2692163

KEYWORDS: Vertical external cavity surface emitting lasers, Magnetism, Microwave radiation, Diamond, Infrared radiation, Laser damage threshold, Light absorption, Signal detection, Magnetometers, Quantum magnetometry

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Proceedings Article | 10 October 2023 Poster + Paper

Growth of 6.2 Å semiconductor topological materials on lattice engineered virtual substrates

H. Haugan, A. Hilton, K. Mahalingam, A. Neal, S. Elhamri, R. Bedford, K. Eyink

Proceedings Volume 12687, 126870G (2023) https://doi.org/10.1117/12.2675731

KEYWORDS: Quantum wells, Antimony, Gallium arsenide, Gallium, Transmission electron microscopy, Quantum buffers, Interfaces, Gallium antimonide, Crystals, Aluminum

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Proceedings Article | 4 October 2023 Presentation + Paper

Impact of waveguide imperfections on lasing near a stationary inflection point

Nathaniel Furman, Albert Herrero-Parareda, Bradley Thompson, Dean Brown, Ricky Gibson, Ilya Vitebskiy, Robert Bedford, Filippo Capolino

Proceedings Volume 12647, 126470C (2023) https://doi.org/10.1117/12.2677923

KEYWORDS: Waveguides, Fabrication, Imperfections, Simulations, Analytic models, Terahertz radiation, Tolerancing, Finite element methods, Distributed Bragg reflectors, Design and modelling

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Proceedings Article | 4 March 2022 Presentation + Paper

High peak power GaSb-based VECSELs

Jacob Hoehler, Ricky Gibson, Bradley Thompson, Robert Bedford

Proceedings Volume 11984, 1198406 (2022) https://doi.org/10.1117/12.2603501

KEYWORDS: Gallium antimonide, Semiconductor lasers, Pulsed laser operation, Short wave infrared radiation

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SPIE Journal Paper | 10 September 2020 Open Access

Special Section Guest Editorial: Active Spectroscopy

Joseph Meola, Robert Bedford, Kristin Dewitt, Timothy Johnson, Christopher Kendziora

OE, Vol. 59, Issue 09, 092001, (September 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.9.092001

KEYWORDS: Spectroscopy, Infrared radiation, Explosives, Particles, Infrared spectroscopy, Infrared detectors, Target detection, Standoff detection, Quantum cascade lasers, Infrared imaging

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Proceedings Article | 15 February 2018 Presentation + Paper

Large pulse-energy VECSELs

Robert Bedford, Ricky Gibson, Joshua Myers

Proceedings Volume 10515, 105150C (2018) https://doi.org/10.1117/12.2292191

KEYWORDS: Photons, Polarization, Semiconductor lasers, Raman spectroscopy, Nonlinear optics, Semiconductors, Laser applications, LIDAR

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SPIE Journal Paper | 19 September 2017 Open Access

Spectrally resolved modal characteristics of leaky-wave-coupled quantum cascade phase-locked laser arrays

Chris Sigler, Ricky Gibson, Colin Boyle, Jeremy Kirch, Donald Lindberg, Thomas Earles, Dan Botez, Luke Mawst, Robert Bedford

OE, Vol. 57, Issue 01, 011013, (September 2017) https://doi.org/10.1117/12.10.1117/1.OE.57.1.011013

KEYWORDS: Near field, Quantum cascade lasers, Optical engineering, Optical simulations, Sensors, Spectroscopy, Device simulation, Pulsed laser operation, Measurement devices, Staring arrays

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Proceedings Article | 1 May 2017 Presentation + Paper

Single and dual-chip high peak-power semiconductor laser

Joshua Myers, Christopher Kokoczka, Gary Cook, Robert Bedford

Proceedings Volume 10192, 101920E (2017) https://doi.org/10.1117/12.2268826

KEYWORDS: Semiconductor lasers, Q switching, Laser range finders, High power lasers, Tunable lasers, Vertical external cavity surface emitting lasers, Reflectivity, Lithium, LIDAR, Nd:YAG lasers, Polarization

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Proceedings Article | 3 March 2014 Paper

Graphene-based saturable absorbers in semiconductor lasers

Saima Husaini, Robert Bedford

Proceedings Volume 8966, 896608 (2014) https://doi.org/10.1117/12.2039714

KEYWORDS: Graphene, Absorption, Mirrors, Mode locking, Semiconductor lasers, Composites, Optical limiting, Solid state lasers, Raman spectroscopy, LIDAR

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Proceedings Article | 12 March 2013 Paper

Progress in orientation-patterned GaP for next-generation nonlinear optical devices

V. Tassev, M. Snure, R. Peterson, K. Schepler, R. Bedford, M. Mann, S. Vangala, W. Goodhue, A. Lin, J. Harris, M. Fejer, Peter Schunemann

Proceedings Volume 8604, 86040V (2013) https://doi.org/10.1117/12.2008057

KEYWORDS: Semiconducting wafers, Absorption, Crystals, Wafer bonding, Frequency conversion, Mid-IR, Nonlinear crystals, Gallium arsenide, Quartz, Vapor phase epitaxy

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Proceedings Article | 26 February 2013 Paper

TEM based analysis of III-Sb VECSELs on GaAs substrates for improved laser performance

P. Ahirwar, D. Shima, T. Rotter, S. P. Clark, S. Addamane, C. Hains, L. Dawson, G. Balakrishnan, R. Bedford, Y. Lai, A. Laurain, J. Hader, J. Moloney

Proceedings Volume 8606, 86060E (2013) https://doi.org/10.1117/12.2005301

KEYWORDS: Gallium arsenide, Gallium antimonide, Quantum wells, Interfaces, Transmission electron microscopy, Phonons, Semiconductor lasers, Neodymium, Image resolution

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Proceedings Article | 15 February 2012 Paper

Recent VECSEL developments for sensors applications

Robert Bedford, Tuoc Dang, David Tomich

Proceedings Volume 8242, 82420W (2012) https://doi.org/10.1117/12.910607

KEYWORDS: Indium, Sensors, Semiconductor lasers, Semiconductors, Quantum wells, Quantum cascade lasers, Mirrors, High power lasers, Mid-IR, Vertical external cavity surface emitting lasers

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Proceedings Article | 22 February 2011 Paper

Power scaling of cw and pulsed IR and mid-IR OPSLs

J. Moloney, J. Hader, T.-L. Wang, Yi. Ying, Y. Kaneda, J. M. Yarborough, T. Rotter, G. Balakrishnan, C. Hains, S. Koch, W. Stolz, B. Kunert, R. Bedford

Proceedings Volume 7919, 79190S (2011) https://doi.org/10.1117/12.874201

KEYWORDS: Mid-IR, Quantum wells, Reflectivity, Gallium arsenide, Semiconductor lasers, Semiconductors, Etching, Reflection, Absorption

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Proceedings Article | 22 February 2011 Paper

Lateral lasing and ASE reduction in VECSELs

Chris Hessenius, Mahmoud Fallahi, Jerome Moloney, Robert Bedford

Proceedings Volume 7919, 791909 (2011) https://doi.org/10.1117/12.875595

KEYWORDS: Germanium, Quantum wells, Reflection, Stars, Mirrors, Vertical external cavity surface emitting lasers, Semiconductors, Output couplers, Optical lithography, Semiconducting wafers

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Proceedings Article | 22 February 2011 Paper

Gain coupling VECSELs

Robert Bedford, Chris Hessenius, Nathan Terry, Jerome Moloney, Mahmoud Fallahi

Proceedings Volume 7919, 791906 (2011) https://doi.org/10.1117/12.873864

KEYWORDS: Photons, Electronic filtering, Optical filters, Switching, Switches, Lasers, Laser resonators, Optical switching, Semiconductors, Mirrors

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Proceedings Article | 24 January 2011 Paper

Latest progress in high power VECSELs

Robert Bedford, Nathan Terry, Chris Hessenius, Mahmoud Fallahi, Jerome Moloney

Proceedings Volume 7945, 794508 (2011) https://doi.org/10.1117/12.873871

KEYWORDS: Semiconductor lasers, Semiconductors, Mirrors, Modulation, Laser applications, Semiconductor materials, Thermal effects, Lanthanum, Vertical external cavity surface emitting lasers, Optical components

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Proceedings Article | 26 February 2010 Paper

Analysis and characterization of the small-signal modulation of a vertical external cavity surface emitting laser

N. Terry, M. Walton, R. Bedford

Proceedings Volume 7597, 75972B (2010) https://doi.org/10.1117/12.852283

KEYWORDS: Modulation, Modulation transfer functions, Scattering, Absorption, Reflectivity, Output couplers, Mirrors, Semiconductor lasers, Vertical external cavity surface emitting lasers, Semiconductors

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SPIE Journal Paper | 1 July 2007

Flip bonding with SU-8 for hybrid AlxGa1-xAs-polysilicon MEMs-tunable filter

Edward Ochoa, Lavern Starman, Robert Bedford, Thomas Nelson, James Ehret, Michael Harvey, Travis Anderson, Fan Ren

JM3, Vol. 6, Issue 03, 033007, (July 2007) https://doi.org/10.1117/12.10.1117/1.2767326

KEYWORDS: Gold, Actuators, Aluminum, Gallium, Reflectors, Microelectromechanical systems, Silicon, Distributed Bragg reflectors, Optical lithography, Chemistry

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Proceedings Article | 24 May 2005 Paper

Power-limiting mechanisms in VECSELs

R. Bedford, M. Kolesik, J. Chilla, M. Reed, T. Nelson, J. Moloney

Proceedings Volume 5814, (2005) https://doi.org/10.1117/12.607428

KEYWORDS: Mirrors, Semiconductors, Quantum wells, Reflectivity, Luminescence, Surface roughness, Semiconductor lasers, Vertical cavity surface emitting lasers, Disk lasers, Scattering

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Proceedings Article | 19 June 2003 Paper

Semiconductor unstable resonators with laterally finite mirrors

Robert Bedford, Li Fan, Mahmoud Fallahi

Proceedings Volume 4993, (2003) https://doi.org/10.1117/12.479459

KEYWORDS: Mirrors, Resonators, Reflectivity, Seaborgium, Absorption, Semiconductors, Semiconductor lasers, High power lasers, Quantum efficiency, Laser damage threshold

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Proceedings Article | 15 May 2001 Paper

Miniaturized organic light-emitting diode (OLED) light source for micro-optical systems

Ari Kaerkkaeinen, Juha Rantala, Maurice Jabbour, Chen Liang, Robert Bedford, Nasser Peyghambarian, Michael Descour, Ghassan Jabbour

Proceedings Volume 4284, (2001) https://doi.org/10.1117/12.426861

KEYWORDS: Organic light emitting diodes, Light sources, Optical components, Photomasks, Chemical elements, Microscopes, Silicon, Electrodes, Glasses, Semiconducting wafers

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