Sensitive wavelength-modulated photoacoustic spectroscopy with a pulsed optical parametric oscillator
- 1 June 2004
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 29 (11) , 1206-1208
- https://doi.org/10.1364/ol.29.001206
Abstract
With a laser-excited acoustic wave as the carrier wave and by modulation of the light wavelength of a multikilohertz-repetition-rate optical parametric oscillator at a lower frequency than the acoustic frequency, we demonstrate a wavelength–amplitude double-modulation technique and achieve an enhancement factor of 35 in sensitivity in photoacoustic trace gas detection with the technique.Keywords
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