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External cavity tunable type-I diode laser with continuous-wave singlemode operation at 3.24μm

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4 Author(s)
Gupta, J.A. ; Inst. for Microstruct. Sci., Nat. Res. Council of Canada, Ottawa, ON, Canada ; Ventrudo, B.F. ; Waldron, P. ; Barrios, P.J.

A tunable external cavity laser (ECL) near 3.24 m was developed using semiconductor laser gain chips based on GaSb. The type-1 interband laser diodes were grown by molecular beam epitaxy using 17 nm InGaAsSb compressively-strained quantum wells with 30 nm AlInGaAsSb quinary barriers for improved hole confinement. In continuous-wave operation with a diode temperature of 10 C, the ECLs produce up to 1.8 mW of singlemode output power with a tuning range of 60 nm. The devices are tunable through the fundamental 3 vibrational absorption features of methane gas, providing a platform for highly-sensitive detection of trace hydrocarbons.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 17 )