26 January 2009 Mid-infrared quantum cascade lasers with high wall plug efficiency
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We demonstrate optimization of continuous wave (cw) operation of 4.6 μm quantum cascade lasers (QCLs). A 19.7 μm by 5 mm, double channel processed device exhibits 33% cw WPE at 80 K. Room temperature cw WPE as high as 12.5% is obtained from a 10.6 μm by 4.8 mm device, epilayer-down bonded on a diamond submount. With the semi-insulating regrowth in a buried ridge geometry, 15% WPE is obtained with 2.8 W total output power in cw mode at room temperature. This accomplishment is achieved by systematically decreasing the parasitic voltage drop, reducing the waveguide loss and improving the thermal management.
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Y. Bai, B. Gokden, S. Slivken, S. R. Darvish, S. A. Pour, M. Razeghi, "Mid-infrared quantum cascade lasers with high wall plug efficiency", Proc. SPIE 7222, Quantum Sensing and Nanophotonic Devices VI, 72220O (26 January 2009); doi: 10.1117/12.810281; https://doi.org/10.1117/12.810281

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