Patent ID: 8290011
Filing Date: 2012-10-16
Classification: B82Y,H01S

Abstract:
1. An interband cascade gain medium, comprising: an active gain region comprising a plurality of cascading stages, each of the cascading stages including an active gain quantum well region comprising one or more active electron quantum wells and one or more active hole quantum wells, a hole injector region comprising one or more hole quantum wells, and an electron injector region comprising one or more electron quantum wells; wherein the thicknesses of the one or more hole quantum wells in the hole injector region are commensurate with a thickness of at least one active hole quantum well in the active gain quantum well region such that the valence band maximum of the hole injector states lies at least 100 meV lower in energy than the valence band maximum of the at least one active hole well in the active gain quantum well region.