Abstract

A near-infrared diode laser with sample-grating distributed Bragg reflectors was used as a widely tunable spectroscopic source for multispecies chemical sensing. Quartz-enhanced photoacoustic spectroscopy was utilized to obtain high absorption sensitivity in a compact gas cell. CO2, H2O, C2H2, and NH3 were monitored. A noise equivalent sensitivity of 8×10-9 cm-1 W-1 Hz-1/2 for NH3 detection was achieved, which corresponds to a NH3 mixing ratio of 4.4 parts in 106 by volume (ppmv) with a 1-s time constant and available 5.2-mW optical power in the gas cell.

© 2004 Optical Society of America

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