We report on novel distributed feedback laser diodes with emission wavelengths as long as 2.9 µm. Single mode laser emission is realized by making use of metal Bragg gratings patterned laterally to the laser ridge. The laser diodes work at room temperature in cw mode and deliver output powers of a few mW. The high side mode suppression ratio of < 35 dB ensures high spectral selectivity within a broad wavelength tuning range of up to 10 nm. These devices promise to be key enablers for a new generation of laser based gas sensing systems featuring previously unreached detection limits.

Date Published: 25 September 2007
PDF: 5 pages
Proc. SPIE 6755, Advanced Environmental, Chemical, and Biological Sensing Technologies V, 675502 (25 September 2007); doi: 10.1117/12.732380

Published in SPIE Proceedings Vol. 6755:
Advanced Environmental, Chemical, and Biological Sensing Technologies V
Tuan Vo-Dinh; Robert A. Lieberman; Günter Gauglitz, Editor(s)