报道了激光二极管侧面抽运Tm,Ho∶LuLF晶体2 μm脉冲激光器。采用环形腔结构, 理论计算了腔型参数, 主要确定了束腰位置和大小, 便于在腔内插入调Q等器件。三方向对称侧面抽运方式, 具有更好的抽运均匀性, 为获得高能量的激光输出提供保障。在自由运转模式下, 脉冲重复频率1 Hz, 抽运能量3.25 J, 获得输出激光单脉冲能量为114 mJ, 光光转换效率为3.5%, 系统斜率效率为8.0%。插入声光调Q, 对应抽运能量2.75 J时, 获得调Q激光输出35 mJ, 脉冲宽度约700 ns。

Experimental results of laser diode lateral-pumped Tm,Ho:LuLF crystal 2-μm ring laser is reported. Using a ring cavity of six mirrors, the beam waist and diameter are determined after theoretically caculating the cavity parameters. And it is convenient for inserting Q-switch in the cavity. Three-direction lateral-pumping is implied for the better pumping homogeneity and getting high pulse energy laser. In the free running mode, when the pumping energy is 3.25 J, and the pulse repetition frequency is 1 Hz the maximum laser energy is 114 mJ per pulse with the optical efficiency of 3.5% and the slope efficiency of 8.0% in the system. In the Q-switched mode, when the pumping energy is 2.75 J, 35-mJ Q-switched laser with pulse duration of about 700 ns is obtained.