20 February 2017 High internal differential efficiency mid-infrared quantum cascade lasers
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Proceedings Volume 10123, Novel In-Plane Semiconductor Lasers XVI; 101230Q (2017) https://doi.org/10.1117/12.2249537
Event: SPIE OPTO, 2017, San Francisco, California, United States
Implementation of the step-taper active-region (STA) design to 8-9 μm-emitting quantum cascade lasers (QCLs) has resulted in both high T0 and T1 values: 220 K and 665 K, and short lower-level lifetimes: 0.12 ps. In turn, the internal differential efficiency ηid, which is the product of the injection efficiency and the differential laser-transition efficiency, reaches values as high as 86 % for both 8.4 μm- and 8.8 μm-emitting QCLs. Such ηid values are 30-50% higher than those obtained from conventional QCLs emitting in the 7-11 μm wavelength range. Achieving both carrier-leakage suppression and miniband-like carrier extraction in mid-infrared (IR) QCLs leads to ηid values close to the fundamental limit of ~ 90 %. In turn, the currently employed fundamental wallplug-efficiency limits over the mid-IR wavelength range have to be increased by ~ 34 % (e.g., the wallplug-efficiency limit at λ= 4.6 μm increases from 29 % to 39 %). Preliminary results from STA-type 4.8-5.0 μm-emitting QCLs include 1.5 W CW operation, and 77 % internal differential efficiency; that is, 30-50% higher than the ηid values obtained from conventional 4.0-6.5μm-emitting QCLs.
Conference Presentation
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dan Botez, Dan Botez, Jeremy D. Kirch, Jeremy D. Kirch, Chun-Chieh Chang, Chun-Chieh Chang, Colin Boyle, Colin Boyle, Honghyuk Kim, Honghyuk Kim, Kevin M. Oresick, Kevin M. Oresick, Chris Sigler, Chris Sigler, Luke J. Mawst, Luke J. Mawst, Minhyeok Jo, Minhyeok Jo, Jae Cheol Shin, Jae Cheol Shin, Gun-Kim Doo, Gun-Kim Doo, Don F. Lindberg, Don F. Lindberg, Thomas L. Earles, Thomas L. Earles, } "High internal differential efficiency mid-infrared quantum cascade lasers", Proc. SPIE 10123, Novel In-Plane Semiconductor Lasers XVI, 101230Q (20 February 2017); doi: 10.1117/12.2249537; https://doi.org/10.1117/12.2249537

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