SINGLE-FREQUENCY GALNASSB ALGAASSB QUANTUM-WELL RIDGE-WAVE-GUIDE LASERS EMITTING AT 2.1 MU-M/

Ridge-waveguide lasers emitting at approximately 2.1 mum have been fab ricated from a GaInAsSb/AlGaAsSb quantum-well heterostructure grown on a GaSb substrate by molecular beam epitaxy. The cw threshold current is as low as 29 mA at room temperature, and the maximum cw output powe r is 28 mW. The lasers operate in a single longitudinal mode which can be continuously tuned without mode hopping over 1.2 nm by changing th e heatsink temperature and over 0.8 nm by changing the current.