The optical gains observed in molecular iodine lasers are the result of competition between stimulated emission and absorption losses from the excitedBelectronic state. The ratio of the cross sections for stimulated emission and absorption is sim;2.5 (vPrime;= odd) and sim;1.0 (vPrime;= even) forvprime;= 43rarr;vPrime;= 7ndash;15. The correct consideration of this competition removes the apparent anomaly of nonobservable laser emission tovPrime;= even in this spectral region.
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