Prof. Benjamin S. Williams Profile

Prof. Benjamin S. Williams

Professor at Univ of California Los Angeles

SPIE Involvement:

Author

Publications (26)

Proceedings Article | 13 March 2024 Presentation

Investigation of self-mixing in a THz quantum-cascade VECSEL under optical feedback

Anthony Kim, Daniel McGovern, Sadhvikas Addamane, Benjamin Williams

Proceedings Volume PC12905, PC129050M (2024) https://doi.org/10.1117/12.3001981

KEYWORDS: Terahertz radiation, Vertical external cavity surface emitting lasers, Quantum optics, Quantum cascade lasers, Output couplers, Waveguides, Waveguide lasers, Vibration, Quantum phenomena, Quantum effects

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Proceedings Article | 13 March 2024 Presentation

Multi-mode lasing in metasurface QC-VECSELs under RF current modulation

Yu Wu, John Reno, Christopher Curwen, Benjamin Williams

Proceedings Volume PC12905, PC129050L (2024) https://doi.org/10.1117/12.3003375

KEYWORDS: Modulation, Frequency modulation, Vertical external cavity surface emitting lasers, Reflection, Modulation frequency, Frequency combs, Quantum chips, Mode locking, Lasers, Hole burning spectroscopy

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Proceedings Article | 13 March 2024 Presentation

GaAs-based quantum cascade lasers for the 5-6 THz range

Mohammad Shahili, Sadhvikas Addamane, Christopher Curwen, Jonathan Kawamura, Benjamin Williams

Proceedings Volume PC12905, PC129050K (2024) https://doi.org/10.1117/12.3002200

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Design and modelling, Continuous wave operation, Laser frequency, Molecular spectroscopy, Waveguides, Spectroscopy, Semiconductors, Scattering

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Proceedings Article | 9 March 2024 Presentation

Optical injection locking of a terahertz quantum-cascade VECESL with a diode frequency multiplier source

Christopher Curwen, Anthony Kim, Boris Karasik, Jonathan Kawamura, Benjamin Williams

Proceedings Volume PC12895, PC128950G (2024) https://doi.org/10.1117/12.3001146

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Diodes, Quantum frequencies, Quantum sources, Spectroscopy, Signal to noise ratio, Phase shift keying, Amplitude modulation, Vertical external cavity surface emitting lasers

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Proceedings Article | 24 March 2023 Presentation

Towards active mode locking in terahertz metasurface quantum-cascade lasers

Benjamin Williams

Proceedings Volume PC12419, PC1241901 (2023) https://doi.org/10.1117/12.2649207

KEYWORDS: Mode locking, Terahertz radiation, Waveguides, Vertical external cavity surface emitting lasers, Quantum cascade lasers, Picosecond phenomena, Output couplers, Hole burning spectroscopy, Antennas

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Proceedings Article | 17 March 2023 Poster

Design strategies for GaAs-based THz quantum-cascade lasers in the 5-6 THz range

Mohammad Shahili, Benjamin Williams

Proceedings Volume PC12440, PC124400V (2023) https://doi.org/10.1117/12.2650242

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Scattering, Molecular spectroscopy, Laser scattering, Spectroscopy, Semiconductors, Phonons, Oscillators, Molecular lasers

Proceedings Article | 17 March 2023 Presentation

Effects of output coupler on THz quantum-cascade VECSELs tunable between 2.5-3.0 THz

Anthony Kim, Yu Wu, Sadhvikas Addamane, Benjamin Williams

Proceedings Volume 12404, 1240409 (2023) https://doi.org/10.1117/12.2649234

KEYWORDS: Terahertz radiation, Output couplers, Silicon, Quartz, Oscillators, Laser damage threshold, Heterodyning, Fabry–Perot interferometers, Deep reactive ion etching, Antireflective coatings

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Proceedings Article | 17 March 2023 Presentation

THz quantum-cascade VECSELs based upon disordered metasurfaces

Eilam Morag, Sandra Li, Anthony Kim, Sadhvikas Addamane, Benjamin Williams

Proceedings Volume 12404, 124040E (2023) https://doi.org/10.1117/12.2648477

KEYWORDS: Terahertz radiation, Coherence imaging, Spatial coherence, Lasers, Laser applications, Holography, High power lasers, Antennas

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Proceedings Article | 17 March 2023 Presentation

RF injection locking of THz metasurface quantum-cascade-VECSEL

Yu Wu, Christopher Curwen, John Reno, Benjamin Williams

Proceedings Volume PC12440, PC124400R (2023) https://doi.org/10.1117/12.2647914

KEYWORDS: Terahertz radiation, Modulation, Mode locking, Frequency combs, Diffraction, Combustion

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Proceedings Article | 26 August 2022 Presentation

Terahertz quantum-cascade VECSELs local oscillators for heterodyne receivers

Christopher Curwen, Jonathan Kawamura, Darren Hayton, Yu Wu, Sadhvikas Addamane, John Reno, Benjamin Williams, Boris Karasik

Proceedings Volume PC12190, PC121900A (2022) https://doi.org/10.1117/12.2629058

KEYWORDS: Heterodyning, Receivers, Oscillators, Terahertz radiation, Spectroscopes, Sensors, Quantum cascade lasers, Observatories, Mode locking, Microwave radiation

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Proceedings Article | 1 April 2022 Presentation

Towards quantum-cascade VECSELs for terahertz heterodyne local oscillators

Christopher Curwen, Anthony Kim, Yu Wu, Yue Shen, Darren Hayton, Jonathan Kawamura, Boris Karasik, Sadhvikas Addamane, John Reno, Benjamin Williams

Proceedings Volume PC11984, PC1198402 (2022) https://doi.org/10.1117/12.2615672

KEYWORDS: Terahertz radiation, Heterodyning, Oscillators, Laser stabilization, Antennas, Mode locking, Microwave radiation, Doppler effect, Diodes, Continuous wave operation

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Proceedings Article | 9 March 2022 Presentation

Multi-mode lasing in terahertz metasurface quantum-cascade VECSELs

Yu Wu, Sadhvikas Addamane, John Reno, Benjamin Williams

Proceedings Volume PC12021, PC120210F (2022) https://doi.org/10.1117/12.2606690

KEYWORDS: Reflectivity, Output couplers, Frequency combs, Terahertz radiation, Silicon, Mode locking, Lasers, Hole burning spectroscopy, Fabry–Perot interferometers, Continuous wave operation

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Proceedings Article | 9 March 2020 Presentation

Frequency-agile metasurface quantum-cascade lasers (Conference Presentation)

Christopher Curwen, John Reno, Benjamin Williams

Proceedings Volume 11301, 1130114 (2020) https://doi.org/10.1117/12.2549124

KEYWORDS: Laser resonators, Tunable lasers, Wave propagation, Waveguides, Terahertz radiation

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Proceedings Article | 13 March 2019 Presentation

High-power terahertz metasurface quantum-cascade VECSELs (Conference Presentation)

Benjamin Williams, Christopher Curwen, John Reno

Proceedings Volume 10901, 1090109 (2019) https://doi.org/10.1117/12.2513477

KEYWORDS: Terahertz radiation, Antennas

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Proceedings Article | 13 March 2019 Presentation

Short-cavity THz QC-VECSEL with 20% fractional tuning (Conference Presentation)

Christopher Curwen, John Reno, Benjamin Williams

Proceedings Volume 10939, 109391P (2019) https://doi.org/10.1117/12.2510419

KEYWORDS: Terahertz radiation, Laser development, Optical resonators

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Proceedings Article | 14 March 2018 Presentation

Quantum-cascade lasers based upon metasurfaces (Conference Presentation)

Benjamin Williams, Luyao Xu, Christopher Curwen, Daguan Chen, John Reno, Tatsuo Itoh

Proceedings Volume 10540, 105401L (2018) https://doi.org/10.1117/12.2293352

KEYWORDS: Polarization, Quantum cascade lasers, Terahertz radiation, Receivers, Nanophotonics, Metamaterials, Graphene, Active plasmonics

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Proceedings Article | 26 January 2018 Presentation + Paper

Temperature dependence of a mid-infrared quantum cascade laser with external optical feedback

O. Spitz, J. Wu, S. Khanal, M. Carras, B. Williams, C. W. Wong, F. Grillot

Proceedings Volume 10540, 105401N (2018) https://doi.org/10.1117/12.2290117

KEYWORDS: Quantum cascade lasers, Mid-IR, Semiconductor lasers, Free space optics, Laser optics, Laser stabilization, Atmospheric optics

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Proceedings Article | 19 September 2017 Presentation

Terahertz metasurface quantum-cascade VECSEL (Conference Presentation)

Luyao Xu, Christopher Curwen, Daguan Chen, John Reno, Tatsuo Itoh, Benjamin Williams

Proceedings Volume 10383, 1038306 (2017) https://doi.org/10.1117/12.2273447

KEYWORDS: Terahertz radiation, Semiconductor lasers, High power lasers, Laser resonators, Waveguides, Quantum cascade lasers, Laser optics, Electrons, Quantum wells, Reflectors

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Proceedings Article | 20 April 2017 Presentation

Terahertz quantum-cascade metasurface VECSELs (Conference Presentation)

Benjamin Williams, Luyao Xu, Christopher Curwen, John Reno, Tatsuo Itoh

Proceedings Volume 10123, 1012311 (2017) https://doi.org/10.1117/12.2251447

KEYWORDS: Semiconductor lasers, Current controlled current source, Vertical external cavity surface emitting lasers, Antennas, Diffraction, Terahertz radiation, Waveguides

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Proceedings Article | 10 March 2016 Paper

Terahertz quantum cascade VECSEL

Luyao Xu, Christopher Curwen, Philip W. Hon, Tatsuo Itoh, Benjamin Williams

Proceedings Volume 9734, 97340G (2016) https://doi.org/10.1117/12.2213230

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Laser optics, Gaussian beams, Electrons, Quantum wells, Reflectors, Fabry–Perot interferometers, Polarizers, Output couplers, Waveguides, Metals, Reflectivity, Semiconductor lasers, Polarization

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Proceedings Article | 13 May 2011 Paper

Terahertz QC-lasers and active metamaterial antennas

Benjamin Williams, Philip Hon, Amirali Tavallaee, Tatsuo Itoh, QiSheng Chen

Proceedings Volume 8031, 80310K (2011) https://doi.org/10.1117/12.883583

KEYWORDS: Terahertz radiation, Metamaterials, Waveguides, Antennas, Polarization, Quantum cascade lasers, Wave propagation, Microwave radiation, Metals, Capacitors

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Proceedings Article | 29 January 2008 Paper

High-temperature and high-power operation of terahertz quantum-cascade lasers

Sushil Kumar, Alan Lee, Qi Qin, Benjamin Williams, Qing Hu, John Reno

Proceedings Volume 6909, 69090I (2008) https://doi.org/10.1117/12.768298

KEYWORDS: Waveguides, Quantum cascade lasers, Terahertz radiation, Reflectivity, Pulsed laser operation, Gallium arsenide, Mirrors, Wave propagation, Radio propagation, Semiconducting wafers

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Proceedings Article | 8 February 2007 Paper

High-temperature and high-power terahertz quantum-cascade lasers

Benjamin Williams, Qi Qin, Sushil Kumar, Qing Hu, John Reno

Proceedings Volume 6485, 64850M (2007) https://doi.org/10.1117/12.714207

KEYWORDS: Terahertz radiation, Quantum cascade lasers, Waveguides, Phonons, Electrons, Temperature metrology, Continuous wave operation, Semiconducting wafers, Imaging spectroscopy

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Proceedings Article | 23 January 2006 Paper

THz quantum semiconductor devices

H.C. Liu, H. Luo, D. Ban, M. Wächter, C. Y. Song, Z. R. Wasilewski, M. Buchanan, G. C. Aers, A. J. SpringThorpe, J. C. Cao, S. L. Feng, B. S. Williams, Q. Hu

Proceedings Volume 6029, 602901 (2006) https://doi.org/10.1117/12.667658

KEYWORDS: Terahertz radiation, Doping, Absorption, Quantum well infrared photodetectors, Quantum cascade lasers, Gallium arsenide, Aluminum, Phonons, Waveguides, Temperature metrology

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Proceedings Article | 1 April 2005 Paper

Terahertz quantum cascade lasers with metal-metal waveguides

Benjamin Williams, Stephen Kohen, Sushil Kumar, Qing Hu, John Reno

Proceedings Volume 5738, (2005) https://doi.org/10.1117/12.597122

KEYWORDS: Waveguides, Terahertz radiation, Quantum cascade lasers, Reflectivity, Wafer bonding, Metals, Semiconducting wafers, Continuous wave operation, Mirrors, Resistance

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Proceedings Article | 11 May 2004 Paper

Terahertz quantum cascade lasers using resonant-phonon depopulation and metal-metal waveguides

Benjamin Williams, Sushil Kumar, Hans Callebaut, Stephen Kohen, Qing Hu, John Reno

Proceedings Volume 5365, (2004) https://doi.org/10.1117/12.530087

KEYWORDS: Waveguides, Terahertz radiation, Quantum cascade lasers, Continuous wave operation, Resistance, Gallium arsenide, Temperature metrology, Phonons, Picosecond phenomena

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Showing 5 of 26 publications

Conference Committee Involvement (5)

Terahertz Emitters, Receivers, and Applications VIII

6 August 2017 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications VII

28 August 2016 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications VI

11 August 2015 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications V

17 August 2014 | San Diego, California, United States

Terahertz Emitters, Receivers, and Applications IV

25 August 2013 | San Diego, California, United States

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