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15 March 2023 Lens-coupled sub-THz and THz quantum cascade laser sources based on intra-cavity frequency mixing
Shohei Hayashi, Akio Ito, Tatsuo Dougakiuchi, Masahiro Hitaka, Atsushi Nakanishi, Kazuue Fujita
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Proceedings Volume 12430, Quantum Sensing and Nano Electronics and Photonics XIX; 1243007 (2023) https://doi.org/10.1117/12.2648566
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We present a tunable nonlinear QCL structure that uses an external-cavity lens-coupled Cherenkov waveguide, where a silicon lens is closely coupled to the device substrate to provide greatly enhanced THz coupling efficiency and considerable performance enhancements over existing devices. A source operating at room temperature outputs a peak power of 0.2 mW at 1.5 THz. Additionally, device tuning over an operating frequency range from 420 GHz up to 2 THz was demonstrated. The operating frequency of 420 GHz is the lowest reported operating frequency for room-temperature QCL sources.
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Shohei Hayashi, Akio Ito, Tatsuo Dougakiuchi, Masahiro Hitaka, Atsushi Nakanishi, and Kazuue Fujita "Lens-coupled sub-THz and THz quantum cascade laser sources based on intra-cavity frequency mixing", Proc. SPIE 12430, Quantum Sensing and Nano Electronics and Photonics XIX, 1243007 (15 March 2023); https://doi.org/10.1117/12.2648566
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KEYWORDS
Terahertz radiation
Quantum cascade lasers
Silicon
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