Abstract
Factors responsible for the width of the stimulated emission spectrum of an XeCl laser are discussed. It is found that at high intracavity intensities (10 MW/cm2) the spectral width is governed by the deformation of the gain profile near the maximum due to weak saturation of the rate of rotational exchange. At fairly high input energies (>0.2 J/cm3), heating of the active medium during a pump pulse shifts the gain maximum and this also broadens the spectrum obtained by time-integrated recording. The experimental data are in good agreement with the proposed analytic model.
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