Continuous wave single mode operation of GaInAsSb/GaSb quantum well lasers emitting beyond 3 μm

We report on room temperature continuous wave single mode GaInAsSb-GaSb quantum well lasers emitting beyond 3 mu m. Quantum well strain and composition were carefully adjusted to enhance the hole confinement without increasing electron confinement in order to avoid inhomogeneous quantum well pumping. In order to realize single mode emission as prerequisite for gas sensing applications, distributed feedback lasers were fabricated. A record single mode emission cw wavelength of 3019 nm with a side mode suppression ratio of more than 30 dB has been obtained. The room temperature peak power output per facet exceeds 3 mW. (C) 2008 American Institute Of Physics.