Luke J. Mawst,1 Jae Ha Ryu,1 Jeremy D. Kirch,1 Morgan Turville-Heitz,1 Shuiq Zhang,1 Dan Botez,1 Benjamin Knipfer,2 Robert A. Marsland,2 Steve Jacobs,2 Axel Strömberg,3 Yan-Ting Sun,3 Sebastian Lourdudoss,3 Tom Earles,4 Steven Ruder,4 Kevin Oresickhttps://orcid.org/0000-0001-5841-3180,4 Chris Galstad,4 Michael Klaus4
1Univ. of Wisconsin-Madison (United States) 2Intraband, LLC (United States) 3KTH Royal Institute of Technology (Sweden) 4DRS Daylight Solutions (United States)
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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, 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