Abstract
Temporal behavior of small signal gain (SSG) in pulsed CO laser operating on oxygen rich gas mixtures CO:He:O<sub>2</sub>=1:4:<i>X</i> and CO:N<sub>2</sub>:O<sub>2</sub>=1:9:<i>X</i> was studied experimentally. The rich content of oxygen (<i>X</i>≥2) in these mixtures resulted in significant increase of the maximum gain on low (6≤V≤13) vibrational transitions V+1→V and strong absorption on high ones (V≥18). Both fundamental and first overtone CO lasing on these gas mixtures were studied. The threshold energy input is demonstrated to be diminished at addition of O<sub>2</sub> for pulsed EBSD CO-laser operating on either fundamental or overtone transitions, with maximum laser efficiency increasing. It is shown that pulsed EBSD CO-laser can effectively operate on air-containing gas mixtures.
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