Sensitive wavelength-modulated photoacoustic spectroscopy with a pulsed optical parametric oscillator |
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| Authors: | Ng Jimmy Kung A H Miklós András Hess Peter |
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| Affiliation: | Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan. |
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| 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. |
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