Abstract

An efficient high-power laser operation has been demonstrated by using a cryogenic Yb:YAG composite ceramic with a total-reflection active-mirror arrangement. The composite ceramic, which had no high-reflection coating and was cooled with liquid nitrogen directly, showed four-level operation even at 67kWcm3 of high pump density. A 273W cw output power was obtained with 65% optical efficiency and 72% slope efficiency.

© 2009 Optical Society of America

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