Abstract

Recently, It has been shown theoretically and experimentally that unstable resonators coupled with variable reflecting mirrors^1,2 can extract filled-in pattern beams. However, the structure of such variable reflecting mirrors is complicated, and moreover it often results in variable phase distortions of the extracted laser beams.³ We report on constructional principles, simulation, and experimental results of a novel unstable resonator that can generate a uniphase beam in a filled-in pattern by the use of a phase-unifying coupler.

© 1988 Optical Society of America