ATMOSPHERIC TRANSMISSION OF $N_{2}O$ LASER ENERGY.
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Date
1969
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Ohio State University
Abstract
The $N_{2}O$ laser operates in the atmospheric window occurring in the wave-length region around 10 microns. Since the amount of $N_{2}O$ in the atmosphere is very small, very little absorption of this radiant energy is expected over long atmospheric paths. A detailed study of the rotational lines of the $00^{\circ}1-10^{\circ}0$ band of $N_{2}O$ was undertaken in order to study the effect of atmospheric absorption. The laser tube containing $N_{2}O$ was placed in a cavity in which one mirror was replaced by a grating.$^{1}$ By turning the grating 65 rotational lines appeared whose frequencies were determined. Absorption of this energy by $N_{2}O$ was observed by use of a 10 m long absorption cell filled with $N_{2}O$. When the absorption cell was filled with $CO_{2}$ strong absorption was observed at R(10), R(12), R(14) and P(7) of the studied band of $N_{2}O$. This absorption occurs since these lines coincide in frequency with lines of the $00^{\circ}1-10^{\circ}0$ band of $CO_{2}$. It follows that the strongest lines of $N_{2}O$ occurring around P(19), are not obstructed by $CO_{2}$ in the atmosphere. This research was sponsored by the Air Force Office of Scientific Research under Grant EOOAR 69 0053, through the European Office of Aerospace Research (OAR), U.S. Air Force.
Description
$^{1}$ U.P. Oppenheim and A. D. Devir, J. Opt. Soc. Am. 58, 585 (1968).
Author Institution: Department of Physics, Technion, Israel Institute of Technology
Author Institution: Department of Physics, Technion, Israel Institute of Technology