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13 March 2019 Physics and applications of harmonic frequency combs in quantum cascade lasers (Conference Presentation)
Yongrui Wang, Alexey Belyanin
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Proceedings Volume 10939, Novel In-Plane Semiconductor Lasers XVIII; 1093917 (2019) https://doi.org/10.1117/12.2510992
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
Recently a new harmonic regime in quantum cascade lasers (QCLs) was discovered, in which a mid-infrared QCL generates an equidistant coherent comb of isolated modes separated by several hundred GHz. Here we use Maxwell equations in space-time domain coupled to a realistic active region model to analyze the physics and possible applications of the harmonic frequency combs. Our calculations show that the harmonic state can be self-supported due to four-wave mixing in a specific region of the parameter space. The properties of the harmonic state are discussed in detail. We also examine the beat oscillations of the electron populations in the active region, which can lead to current oscillations on the QCL chip and generation of (sub-)THz radiation.
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Yongrui Wang and Alexey Belyanin "Physics and applications of harmonic frequency combs in quantum cascade lasers (Conference Presentation)", Proc. SPIE 10939, Novel In-Plane Semiconductor Lasers XVIII, 1093917 (13 March 2019); https://doi.org/10.1117/12.2510992
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KEYWORDS
Quantum cascade lasers
Frequency combs
Physics
Four wave mixing
Maxwell's equations
Mid-IR
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