Abstract

We propose a scheme of a ring unstable resonator with multipass geometry, which allows overcoming the problem of low gain of a disk active element. The original design of the laser resonator enables power scaling using a larger pump aperture of the active element, maintaining good beam quality. The developed resonator operates with a disk Yb:YAG active element and output beam quality ${\mathrm{M}}^2=2$ at 2.5 magnification, which agrees well with the results of modeling.

© 2019 Optical Society of America

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