Abstract

Applying the concept of binary superimposed gratings, widely tunable single-mode laser diodes suitable for multispecies gas detection in the $1.8\mathrm{\mu m}$ wavelength range could be manufactured on InAs/InGaAs quantum dash-in-a-well material. A discrete wavelength tuning range of $21\mathrm{nm}$ as well as continuous tuning over $0.8\mathrm{nm}$ are demonstrated. Water and hydrogen chloride could be detected at absorption lines $13\mathrm{nm}$ apart.

© 2008 Optical Society of America