Applying the concept of binary superimposed gratings, widely tunable single-mode laser diodes suitable for multispecies gas detection in the 1.8 μm wavelength range could be manufactured on InAs/InGaAs quantum dash-in-a-well material. A discrete wavelength tuning range of 21 nm as well as continuous tuning over 0.8 nm are demonstrated. Water and hydrogen chloride could be detected at absorption lines 13 nm apart.
© 2008 Optical Society of America
Original Manuscript: July 15, 2008
Revised Manuscript: October 10, 2008
Manuscript Accepted: October 17, 2008
Published: November 17, 2008
W. Zeller, M. Legge, J. Seufert, R. Werner, M. Fischer, and J. Koeth, "Widely tunable laterally coupled distributed feedback laser diodes for multispecies gas analysis based on InAs/InGaAs quantum-dash material," Appl. Opt. 48, B51-B56 (2009)