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. , , , and were monitored. A noise equivalent sensitivity of for detection was achieved, which corresponds to a mixing ratio of 4.4 parts in 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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