Continuous wave operation of mid-infrared type-II interband cascade lasers

Summary form only given. We believe we report the first cw operation of type-II interband cascade lasers. The IC laser structure, grown in a Varian Gen-II MBE system on a GaSb substrate, consists of 23 cascaded InAs-GaInSb QW active regions and has a high structural quality as evidenced by many sharp satellite peaks in a double-crystal X-ray diffraction.