Abstract

A vertical cavity surface-emitting laser was studied for gas-sensing applications. Properties of the 962-nm laser that were measured include side-mode suppression, wavelength tuning with temperature and current, power versus injection current, and the amplitude noise spectrum. With wavelength modulation spectroscopy, a rms noise level of 2 × 10^-4 absorbance units was achieved. The large current tuning range (25 cm^-1) and smaller amplitude modulation (11%/cm^-1) of the vertical cavity laser compare favorably with Fabry–Perot and distributed feedback diode lasers for spectroscopic gas sensing, especially at atmospheric pressure.

© 1997 Optical Society of America

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