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通过对Yb∶YAG晶体荧光谱线的分析,讨论了其低温条件下的增益特性。利用激光二极管作为抽运源,采用背向端面抽运方式,使用掺杂原子数分数为8%的片状Yb∶YAG晶体,搭建了一台低温条件下工作的再生放大器。通过小能量信号光注入,在-90℃的低温下,可以得到重复频率10Hz,脉宽10ns,能量10.3mJ的激光脉冲输出,放大倍数达107倍。
By analyzing the fluorescence spectrum of Yb:YAG crystal, the gain characteristics under low temperature are discussed. A laser diode was used as a pumping source, and a back-end pumping method was used. A Yb:YAG crystal with 8% atomic number was used to build a regenerative amplifier operating at low temperature. By injecting small energy signal light, the laser pulse output with the repetition frequency of 10Hz, the pulse width of 10ns and the energy of 10.3mJ can be obtained at a low temperature of -90 ° C, with a magnification of 107 times.