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13 February 2016 Interband cascade lasers with CW wallplug efficiency higher than 40% at low temperatures
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Abstract
We report cw wallplug efficiencies (WPEs) for mid-infrared interband cascade lasers (ICLs) that are comparable to those of state-of-the-art quantum cascade lasers at temperatures ranging from the cryogenic regime to room temperature. The continuous wave (cw) WPE for 10-stage broad-area devices remains above 40% for temperatures up to 125 K, and is still <30% at T = 175 K. At 80 K the threshold current density for a 2-mm-long cavity is only 11 A/cm2, and slope efficiencies are < 2.2 W/A at all temperatures ≤ 200 K. A 32-μm-wide × 3-mm-long ridge with 7 active stages and high-reflection and anti-reflection coatings on the two facets displays a cw WPE of 24% at T = 200 K and 12% at T = 300 K. The cw WPE of another narrow-ridge ICL was 18% at room temperature.
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C. D. Merritt, W. W. Bewley, C. L. Canedy, C. S. Kim, M. Kim, I. Vurgaftman, and J. R. Meyer "Interband cascade lasers with CW wallplug efficiency higher than 40% at low temperatures", Proc. SPIE 9755, Quantum Sensing and Nano Electronics and Photonics XIII, 97550G (13 February 2016); https://doi.org/10.1117/12.2209388
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