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17 March 2023 Effects of output coupler on THz quantum-cascade VECSELs tunable between 2.5-3.0 THz
Anthony D. Kim, Yu Wu, Sadhvikas J. Addamane, Benjamin S. Williams
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Proceedings Volume 12404, Vertical External Cavity Surface Emitting Lasers (VECSELs) XII; 1240409 (2023) https://doi.org/10.1117/12.2649234
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
Terahertz (THz) quantum-cascade VECSELs are strong candidates for frequency-agile local oscillators for next generation heterodyne instruments for astrophysical observations. In this work, a THz QC-VECSEL with a tuning range of 2.48 THz to 2.95 THz (17% fractional) is demonstrated. Additionally, the effects of the output coupler are studied since the frequency dependent reflectance of the output coupler causes variation in the laser properties with tuning. To suppress Fabry-Perot oscillations, a silicon output coupler with an etch-based anti-reflective coating is demonstrated.
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Anthony D. Kim, Yu Wu, Sadhvikas J. Addamane, and Benjamin S. Williams "Effects of output coupler on THz quantum-cascade VECSELs tunable between 2.5-3.0 THz", Proc. SPIE 12404, Vertical External Cavity Surface Emitting Lasers (VECSELs) XII, 1240409 (17 March 2023); https://doi.org/10.1117/12.2649234
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KEYWORDS
Terahertz radiation
Output couplers
Silicon
Antireflective coatings
Deep reactive ion etching
Fabry–Perot interferometers
Heterodyning
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