Abstract
This paper reports the demonstration of quantum-noise-limited sensitivity in frequency modulation spectroscopy (FMS) with a lead-salt diode laser operating in the 4.8-μm region. Experimentally determined sensitivities of 10−7 in a 1-Hz bandwidth have been demonstrated for detection of CO and CO2 in a single-pass absorption cell. The high sensitivity obtained with our FMS apparatus can be attributed to the use of improved lead-salt diode lasers, a new optical fringe reduction method, and careful attention to optical processing of the diode laser beam.
© 1989 Optical Society of America
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