Abstract

Abstract The output characteristics of a short-pulse discharge-pumped XeCl laser have been examined as a function of the instability of the associated optical resonator. Using a continuously-coupled resonator configuration, the beam divergence, pulse energy and duration are systematically reduced as the roundtrip magnification factor is increased from M = 3 to M = 63. Furthermore, the laser output is shown to depend not simply on the value of M but, in a more complicated way, on the particular single-pass magnifications M 12 and M 21 in the cavity. This is attributed to the shortness of the inversion lifetime in the laser.

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