High-power continuous-wave laser operation was demonstrated with crystals cut along the , , and principal optical axes, achieving a nearly equal slope efficiency of 79%–80% in the absence of thermal effects. The -cut crystal proved to be the most advantageous for power scaling as well as efficient pumping. A maximum output power of was produced from a thick uncoated -cut crystal in a long plano–concave resonator end pumped by a fiber-coupled diode; the corresponding optical-to-optical efficiency was 68%.
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