Interband Cascade Lasers (ICLs) with threshold current densities below 100 A/cm2 in pulsed operation at room temperature are presented. The laser structure comprises 10 active stages of 41 nm length, each stage containing a W-quantum well active region for emission in the spectral region around 3.6 μm. A comparison of devices with 6 and 10 stages shows that the latter have a reduced threshold due to an increased optical confinement factor, very competitive threshold power densities of 428 W cm−2 despite an increased threshold voltage and large differential slope efficiencies of 1390 mW/A. For a narrow ridge device, continuous wave operation is observed up to 65 °C.
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Research Article| June 13 2013
Interband cascade lasers with room temperature threshold current densities below 100 A/cm2
Robert Weih, Martin Kamp, Sven Höfling; Interband cascade lasers with room temperature threshold current densities below 100 A/cm2. Appl. Phys. Lett. 10 June 2013; 102 (23): 231123. https://doi.org/10.1063/1.4811133
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