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Saturation effect for H2O absorption lines at ruby laser wavelengths

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Abstract

The dependence of the spectral coefficient of atmospheric water vapor absorption on ruby-laser radiation intensity has been studied experimentally. Measurements were made using an optoacoustic laser spectrometer with a sensitivity of 10−9 cm−1 J−1. The contours of the H2O absorption lines at 694.215 nm, 694.238 nm, and 694.38 nm were measured at two different values of radiation intensity within 5–100 MW/cm2. The values of the saturation parameter were calculated using the observed decrease of absorption in the line maximum; they were 210 ± 23 MW/cm2, 140 ± 15 MW/cm2, and 180 ± 20 MW/cm2 for the 694.215-nm, 694.238-nm, and 694.38-nm, lines, respectively. The values of the absorption parameter are in satisfactory agreement with the calculated results. The dependence of the saturation parameter on pressures between 250–750 Torr was investigated for the isolated 694.38-nm absorption line.

© 1979 Optical Society of America

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