Abstract
Nineteen new laser lines in the 11-/spl mu/m wavelength region have been observed in CW oscillation from a CO/sub 2/ laser with a high-Q, high-resolution cavity at a higher than usual current density. The frequency of each line has been measured using heterodyne frequency measurement techniques. Analysis of the frequencies shows that 15 lines are rotation-vibration transitions of the 01/sup 1/2-[11/sup 1/1,03/sup 1/1]/sub I/ band (the first sequence hot band) of the CO/sub 2/ molecule and four lines belong to the rotation-vibration transitions of the 02/sup 2/1-[12/sup 2/0, 04/sup 2/0]/sub I/ band of CO/sub 2/.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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