Atmospheric water vapor absorption at 1.3 microns

Physics – Optics

Scientific paper

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Absorption Cross Sections, Atmospheric Attenuation, Atmospheric Optics, Infrared Absorption, Iodine Lasers, Water Vapor, Absorption Spectra, Chemical Lasers

Scientific paper

Absolute absorption crross sections for water vapor and water vapor/air mixtures were measured in a frequency range encompassing that of the chemically pumped atomic iodine laser. Measurements were made with a temperature-controlled multipass absorption cell and a high-resolution Fourier transform spectrometer. The measurements covered a broad range of water vapor and air pressures. Several techniques of data analysis were used, and the absorption cross section of 2 kPa of water vapor in an atmosphere of air was determined to be 1.1 + or - 0.2 x 10 to the -24th sq cm. In this paper, an expression is derived which allows estimation of the absorption cross section for any pressure of water vapor and air.

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