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17 March 2023 Low threshold quantum cascade surface emitting lasers
David Stark, Filippos Kapsalidis, Zhixin Wang, Mathieu Bertrand, Ruijun Wang, Bo Meng, Emilio Gini, Mattias Beck, Jérôme Faist
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Proceedings Volume PC12430, Quantum Sensing and Nano Electronics and Photonics XIX; PC124300D (2023) https://doi.org/10.1117/12.2646487
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We present low threshold quantum cascade surface emitting lasers (QCSELs) emitting at wavelengths of 4.5 micrometers or 8 micrometers. To extract the light vertically from the InP-based buried heterostructure laser a second order InGaAs/InP grating is used. Both ridge facets are formed by dry-etching followed by coating a dielectric-metal film. Due to the high reflectivity of the facets, the cavity can be shortened well below 500 micrometers reducing the threshold power to several hundred milliwatts. The proposed device concept allows large-scale fabrication and wafer-level characterization. The results are an important step towards low-cost and low-power consuming quantum cascade lasers for portable MIR gas sensors.
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David Stark, Filippos Kapsalidis, Zhixin Wang, Mathieu Bertrand, Ruijun Wang, Bo Meng, Emilio Gini, Mattias Beck, and Jérôme Faist "Low threshold quantum cascade surface emitting lasers", Proc. SPIE PC12430, Quantum Sensing and Nano Electronics and Photonics XIX, PC124300D (17 March 2023); https://doi.org/10.1117/12.2646487
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KEYWORDS
Quantum cascade lasers
Laser damage threshold
Gas sensors
Mid-IR
Mirrors
Molecular spectroscopy
Molecules
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