Sensitive wavelength-modulated photoacoustic spectroscopy with a pulsed optical parametric oscillator.
نویسندگان
چکیده
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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ورودعنوان ژورنال:
- Optics letters
دوره 29 11 شماره
صفحات -
تاریخ انتشار 2004