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5 March 2021 Self starting harmonic mode locking in THz QCL combs
Giacomo Scalari, Andres Forrer, Mattias Beck, Jerome Faist, Yongrui Wang, Alexey Belyanin
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Proceedings Volume 11705, Novel In-Plane Semiconductor Lasers XX; 117050T (2021) https://doi.org/10.1117/12.2578424
Event: SPIE OPTO, 2021, Online Only
Abstract
THz quantum cascade lasers (QCL) frequency combs are recently attracting attention both as valuable sources for THz spectroscopy as well as a model system to study non linear generation and laser dynamics. Harmonic comb state has proven to be emerging in quantum cascade lasers and promoted by an interplay between parametric gain and spatial hole burning. We report here on robust, self-starting harmonic mode locking in double-metal THz quantum cascade lasers. Different harmonic orders can be excited in the same laser cavity depending on the pumping conditions. The harmonic state can be RF injected and frequency pulled. We study the dependence of harmonic state on the laser cavity and we also report results on harmonic state in external cavities under RF injection.
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Giacomo Scalari, Andres Forrer, Mattias Beck, Jerome Faist, Yongrui Wang, and Alexey Belyanin "Self starting harmonic mode locking in THz QCL combs", Proc. SPIE 11705, Novel In-Plane Semiconductor Lasers XX, 117050T (5 March 2021); https://doi.org/10.1117/12.2578424
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KEYWORDS
Terahertz radiation
Quantum cascade lasers
Mode locking
Laser resonators
Hole burning spectroscopy
Mid-IR
Resonators
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