Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 83, Issue 2, Pages 285-288Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-005-2106-9
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A compact and sensitive photoacoustic setup has been developed based on a recently demonstrated cantilever technique. A micromechanical cantilever transducer is attached to a cylindrical photoacoustic cell and the cantilever's deflection is monitored with a compact Michelson interferometer. A commercial 1-Watt optical fiber amplifier was used to enhance the performance of the system. A normalized sensitivity of 1.4x10(-10) cm(-1) W Hz(-1/2) was achieved in the detection of carbon dioxide at 1572 nm wavelength. Using 34 mW optical power from a DFB diode laser, the noise-equivalent detection limit for carbon dioxide at this wavelength is 4.0 ppm. Employing the fiber amplifier, we improved the sensitivity to yield measurement of sub-ppm concentrations.
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