Type-II antimonide quantum wells for mid-infrared lasers

Abstract This paper discusses some of the key MBE growth issues for type-II Sb-based lasers, and present a summary of our recent progress towards the realization of high-power, high-beam-quality, mid-infrared (IR) lasers based on the “W” configuration of the active region. An optical pumping injection cavity (OPIC) approach has been adopted to improve the external power conversion efficiency. In addition, the first mid-IR angled-grating distributed feedback (α-DFB) lasers producing near-diffraction-limited output is discussed.