Water vapor absorption at 161 wavelengths, from 9.2 to 11.9 μm, of the 12C16O2, 13C16O2, and 14C16O2 lasers was measured using a resonant optoacoustic spectrometer. Results were obtained at several precisely determined vapor concentrations in a flow of pure air at a total pressure of 1 atm. Since the same apparatus and methodology were used for all measurements, a reliable assessment can be made of the relative merits of the three lasers in applications such as atmospheric propagation and ranging.
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