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Absorption spectroscopy of N2O with phase-diffusion-noise sidebands on a lead-salt tunable diode laser

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Abstract

The broad phase-diffusion-noise spectrum of a lead-salt tunable diode laser (TDL) has been exploited for the detection of absorbances produced from low-pressure N2O vapor in the 4.47-μm spectral region. This effect has previously been observed in the detection of electronic transitions in rubidium, cesium, and molecular oxygen with an AlGaAs TDL operating in the 0.700–0.800-μm region. For the first time to our knowledge, this paper presents evidence of this phenomenon when a midinfrared rovibrational absorption line is monitored. The technique is also compared with traditional TDL spectroscopic methods for its applicability to trace-vapor monitoring.

© 1995 Optical Society of America

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