Abstract

A laser long-path absorption system was developed with a hydrogen Raman shifter pumped by a tunable dye laser. The absorption spectrum of CO₂ in the 2-μm region was measured in the open air with a retroreflector or a hard target. The concentration of CO₂ was determined from the spectrum by the least-squares method. Noise in the system was analyzed, and the propagation of error to the obtained concentration was investigated. The statistical error in the concentration was estimated at approximately 1% for a single spectrum measurement. Comparison with the simultaneous measurements with a nondispersive infrared gas analyzer showed good agreement.

© 1993 Optical Society of America

Long-atmospheric-path measurements of near-visible absorption lines of O₂ isotopes and H₂O with a prototype AlGaAs laser transceiver system

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