A diode-bar side-pumped YAG/Nd:YAG/YAG composite crystal laser is presented. A maximum output power of 18.4 W at 1.064 μm with a slop efficiency of 57% and an optical-optical conversion efficiency of 46% was obtained for a pump power of 40 W. Compared with a side-pumped conventional crystal laser in the same experimental conditions, the side-pumped composite crystal laser improved the optical-to-optical conversion efficiency by 12%. Experimental results indicate that a composite crystal can depress the thermal effects effectively and improve the optical-to-optical conversion efficiency easily in the diode side-pumped lasers. The composite crystal has great potential in high-power diode side-pumped lasers.
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Kang et al. (2008) studied this question.
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