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 67 kW/cm~(3) of high pump density. A 273 W cw output power was obtained with 65percent optical efficiency and 72percent slope efficiency.
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机译：通过使用具有全反射有源镜结构的低温Yb：YAG复合陶瓷，已经证明了有效的高功率激光操作。没有高反射涂层且直接用液氮冷却的复合陶瓷即使在高泵密度的67 kW / cm〜（3）下也表现出四级运行。获得了273 W cw的输出功率，光效率为65％，斜率效率为72％。
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