Competition between stimulated emission and absorption losses from the B state in I2 lasers

Abstract
The optical gains observed in molecular iodine lasers are the result of competition between stimulated emission and absorption losses from the excited B electronic state. The ratio of the cross sections for stimulated emission and absorption is ∼2.5 (v = odd) and ∼1.0 (v = even) for v = 43→v = 7–15. The correct consideration of this competition removes the apparent anomaly of nonobservable laser emission to v = even in this spectral region.

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