Abstract
Investigations were made of a pulse-periodic electric-discharge XeCl laser with two types of resonator. When an unstable confocal resonator with a magnification of M = 12 was used, the divergence exceeded the diffraction limit by a factor of only 2?3 and there was only a slight ( ? 30%) reduction in the output energy relative to that from a laser with a plane?plane resonator. The influence of the pulse repetition frequency on the radiation divergence was investigated for helium- and neon-containing gas mixtures. A dependence of the divergence on the pulse repetition frequency was discovered. A theoretical interpretation is given of the results of the experiments.
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