Abstract
A reliable procedure for remote high-accuracy laser detection of N 2O as one of the principal destroyers of the protective ozone layer of the Earth has been developed. The procedure is based on using a CO 2-laser system emitting efficiently in the ∼4.5 μm range. In this case lasing from isotopic modification 12C 18O 2 of carbon dioxide with its subsequent frequency doubling by a nonlinear crystal is used. With the object of reducing the price the composition of the active medium (both for TEA laser and low-pressure longitudinal-discharge-excitation laser) has been optimized. New high-efficiency intracavity frequency doubling schemes based on nonlinear AgGaSe 2 crystals have been developed for CO 2-lasers of both types. Low concentrations of N 2O and concentrations of the principal background gases CO and H 2O have been measured under real atmosphere conditions with the aid of the lidar complex built around these lasers.
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