Interband cascade lasers with AlGaAsSb bulk cladding layers Robert Weih,1,* Adam Bauer,1 Martin Kamp,1 and Sven Höfling1 1
Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany *
[email protected]
Abstract: Interband cascade lasers are promising candidates to cover a wide spectral range in the mid infrared spectral region with high performance devices. In this paper, we report on lasers where the cladding layers consist of quaternary bulk material (AlGaAsSb) instead of InAs/AlSb superlattices. The bulk claddings provide efficient mode confinement due to their low refractive index, comparable heat conductivity and a reduced current spreading. Broad area devices fabricated from laser layers with 5 cascades showed threshold current densities of 220 A/cm2 and narrow ridges operated up to 45 °C in continuous wave mode. ©2013 Optical Society of America OCIS codes: (140.5960) Semiconductor lasers; (140.5965) Semiconductor lasers, quantum cascade; (140.3070) Infrared and far-infrared lasers; (250.5960) Semiconductor lasers materials; (160.6000) Semiconductor materials.
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