Abstract

Experimental investigation of Q-switched Nd:YAG laser, utilizing unstable resonators with variable reflectivity dielectric mirrors is presented. We designed flat-convex and confocal unstable resonator. Gaussian and super-Gaussian variable reflection profiles with various mirror spot sizes are used. Comparison between the used resonator schemes is made by measurement of the following laser parameters: energy extraction, near- and far-field intensity distributions. Output energy of 400 - 450 mJ is obtained for different resonators at repetition frequency up to 5 Hz. The advantages of unstable resonators with variable reflectivity mirrors are demonstrated by efficient frequency conversion of the high power Nd:YAG laser.

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