1969 Volume 42 Issue 12 Pages 3394-3398
The change in the oscillation frequencies of a CO2 laser was examined when foreign gases were introduced into a cell placed inside the cavity. Several gases which have absorption bands around 10 μ region were investigated: sulfur hexafluoride, ammonia, ethylene, trans-dichloroethylene, methyl bromide, trichloroethylene, acrolein, and isopropyl alcohol. The CW laser oscillations in the P-branch of the 9.6 μ band as well as those in the R-branch of the 10.6 μ band were observed when some foreign gases with appropriate pressures were introduced in the cavity. It was also found that the presence of ammonia or methyl bromide even in a very low pressure suppressed the usually strong P(20) line of the 10.6 μ band. This is interpreted as due to a near coincidence of the laser line with one of the vibration-rotation transitions in these molecules.
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