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17 March 2023 Surface-emitting planarized THz quantum cascade laser frequency combs with inverse-designed waveguide facets
Urban Senica, Sebastian Gloor, Paolo Micheletti, Mattias Beck, Jérôme Faist, Giacomo Scalari
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Proceedings Volume PC12430, Quantum Sensing and Nano Electronics and Photonics XIX; PC1243008 (2023) https://doi.org/10.1117/12.2650565
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We present a high-performance planarized waveguide THz quantum cascade laser frequency comb, where an inverse-designed active waveguide front facet with a reduced reflectivity is coupled to a patch array antenna, and all the components are optimized for an octave-spanning emission spectrum (2-4 THz). Broadband frequency comb states spanning over 800 GHz with a single narrow RF beatnote up to -50 dBm are measured at 20 K. The slope efficiency is improved by around five times, with a peak output power of 13 mW in pulsed mode (10% duty cycle at 20 K). Far-field measurements of the surface emission display a narrow symmetric pattern with a beam width of (21° x 20°).
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Urban Senica, Sebastian Gloor, Paolo Micheletti, Mattias Beck, Jérôme Faist, and Giacomo Scalari "Surface-emitting planarized THz quantum cascade laser frequency combs with inverse-designed waveguide facets", Proc. SPIE PC12430, Quantum Sensing and Nano Electronics and Photonics XIX, PC1243008 (17 March 2023); https://doi.org/10.1117/12.2650565
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KEYWORDS
Waveguides
Terahertz radiation
Quantum cascade lasers
Frequency combs
Reflectivity
Metals
Numerical simulations
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