Tokyo Institute of Technology, 2-12-1 O-okayama, Tokyo 152-8550, Japan.
Opt Lett. 2012 Jul 1;37(13):2670-2. doi: 10.1364/OL.37.002670.
We propose a simple and efficient pumping approach for a high-power solar-pumped laser by using a liquid light-guide lens (LLGL) and a hybrid pumping cavity. A 2×2 m Fresnel lens is used as a primary concentrator to collect natural sunlight; 120 W cw laser power and a 4.3% total slope efficiency are achieved with a 6-mm diameter Nd:YAG rod within a 14-mm diameter LLGL. The corresponded collection efficiency is 30.0 W/m(2), which is 1.5 times larger than the previous record. This result is unexpectedly better than that of Cr:Nd:YAG ceramics. It is because the scattering coefficient of Cr:Nd:YAG ceramics is 0.004cm(1), which is 2 times larger than that of the Nd:YAG crystal, although both have similar saturation gains.
我们提出了一种简单而有效的高功率太阳抽运激光器的泵浦方法，该方法使用液体导光透镜（LLGL）和混合泵浦腔。一个 2×2 m 的菲涅尔透镜用作初级聚光器来收集自然光；在 14mm 直径的 LLGL 中，使用 6mm 直径的 Nd:YAG 棒实现了 120 W 的连续波激光功率和 4.3%的总斜率效率。对应的收集效率为 30.0 W/m(2)，比之前的记录高出 1.5 倍。这个结果出人意料地优于 Cr:Nd:YAG 陶瓷。这是因为 Cr:Nd:YAG 陶瓷的散射系数为 0.004cm(1)，是 Nd:YAG 晶体的两倍，尽管它们具有相似的饱和增益。
