Abstract

Unstable resonators combined with variable-reflectivity mirrors seem to be the best choice to control the mode performance and the transverse output beam profile1,2 of laser beams. Such resonators have been successfully applied to TEA-CO2 and to Nd-YAG lasers. The performance of output mirrors with Gaussian3,4, parabolic.5 and super-Gaussian6 reflectivity profiles has been tested in such laser systems.

© 1991 Optical Society of America

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