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将千赫兹高功率全固态Nd∶YAG激光器的增益介质当作厚透镜处理,使用矩阵的方法对等效热透镜腔进行分析。采用多条半导体激光列阵侧向紧凑抽运结构设计,提高了增益介质光抽运的均匀性。根据实际抽运功率,通过模拟计算,设计了平-凸非稳腔。选择的凸面全反镜的最佳曲率半径有效地补偿了增益介质热透镜效应,激光器实现了动态稳腔运转,激光脉冲能量输出斜度效率大于13%,光束发散角优于1.3 mrad。
The gain medium of a kilowatt high-power all-solid-state Nd: YAG laser is treated as a thick lens and the equivalent thermal lens cavity is analyzed using a matrix method. The lateral compact pumping structure design of multiple semiconductor laser arrays improves the uniformity of the optical pumping of the gain medium. Based on the actual pumping power, a flattened convex buckling cavity was designed through simulation calculation. The optimal radius of curvature of the convex total reflection mirror effectively compensates for the thermal lens effect of the gain medium. The laser achieves a dynamic steady-state operation, the laser pulse energy output gradient efficiency is greater than 13%, and the beam divergence angle is better than 1.3 mrad.