Abstract
It is shown that the efficiency of a longitudinal pulsed CO2 laser is dependent on the excitation pulse duration in the range of 5-500 microseconds used in the present study. The maximum efficiency is found to be about 10% at an excitation pulse duration of 90 microseconds and it decreases thereafter. Theoretical calculations have shown that competition between the increasing effectiveness of pumping and the decreasing gain above threshold on increasing the excitation pulse duration are responsible for it optimum value.
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