Monolithic coherent power scaling of mid-ir quantum cascade lasers

Luke J. Mawst; Jae Ha Ryu; Jeremy D. Kirch; Morgan Turville-Heitz; Shuiq Zhang; Dan Botez; Benjamin Knipfer; Robert A. Marsland; Steve Jacobs; Axel Strömberg; Yan-Ting Sun; Sebastian Lourdudoss; Tom Earles; Steven Ruder; Kevin Oresick; Chris Galstad; Michael Klaus

doi:10.1117/12.2651670

17 March 2023 Monolithic coherent power scaling of mid-ir quantum cascade lasers

Luke J. Mawst, Jae Ha Ryu, Jeremy D. Kirch, Morgan Turville-Heitz, Shuiq Zhang, Dan Botez, Benjamin Knipfer, Robert A. Marsland, Steve Jacobs, Axel Strömberg, Yan-Ting Sun, Sebastian Lourdudoss, Tom Earles, Steven Ruder, Kevin Oresick, Chris Galstad, Michael Klaus

Author Affiliations +

Proceedings Volume PC12440, Novel In-Plane Semiconductor Lasers XXII; PC124400S (2023) https://doi.org/10.1117/12.2651670
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Self-heating in mid-infrared QCLs leads to beam instabilities and facet related failures. Single-element 4.6 μm-emitting BH QCLs were fabricated, where a tapered region scales the output power and, ahead of the emitting aperture, a narrow section provides mode filtering for suppressing high-order spatial modes. Beam-stability measurements indicate a small degree of collimated-beam centroid motion (< 0.25 mrad) can be achieved at >1.5W QCW output powers. Comparisons between short-pulse current and QCW operation reveal the impact of thermal lensing on the beam properties, while full 3D modeling provides insights into influence of device geometry on mode selection.

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Luke J. Mawst, Jae Ha Ryu, Jeremy D. Kirch, Morgan Turville-Heitz, Shuiq Zhang, Dan Botez, Benjamin Knipfer, Robert A. Marsland, Steve Jacobs, Axel Strömberg, Yan-Ting Sun, Sebastian Lourdudoss, Tom Earles, Steven Ruder, Kevin Oresick, Chris Galstad, and Michael Klaus "Monolithic coherent power scaling of mid-ir quantum cascade lasers", Proc. SPIE PC12440, Novel In-Plane Semiconductor Lasers XXII, PC124400S (17 March 2023); https://doi.org/10.1117/12.2651670

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KEYWORDS

Quantum cascade lasers

Mid-IR

Continuous wave operation

High power lasers

Mirrors

Reliability

Semiconductor lasers

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