Abstract

Copper-vapor lasers (CVL’s) with positive-branch unstable resonators have been used extensively for reducing output-beam divergence. In contrast, the negative-branch unstable resonator has not been applied to CVL’s. Here we study the performance of a negative-branch unstable-resonator CVL with various magnifications. A divergence of approximately 3.25 times the diffraction limit was obtained.

© 1990 Optical Society of America

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