Patent ID: 8125706
Filing Date: 2012-02-28
Classification: B82Y,H01S

Abstract:
1. An interband cascade gain medium, comprising: an active gain region, the active gain region having a first end and a second end opposite the first end and comprising a plurality of cascading stages, each of the cascading stages including an active gain quantum well region, a hole injector region adjacent the active gain quantum well region, and an electron injector region adjacent the hole injector region, each of the active gain quantum well region, the hole injector region, and the electron injector region comprising a plurality of electron barriers and at least one of an electron quantum well and a hole quantum well, the active gain region having an active gain quantum well region of a first stage at the first end thereof and an electron injector region of a last stage at the second end thereof; wherein at least one hole injector region of at least one stage of the active gain region is separated from an adjacent electron injector region by an electron barrier comprising one of AlSb and AlGaInAsSb and having a thickness at least about 20 Å.