为了提高传导冷却条件下激光二极管(LD)侧向抽运被动调Q激光器的光束质量和输出稳定性,采用了两组半圆柱面激光二极管阵列侧向交错抽运两根串接的激光棒,实现了均匀抽运和散热。通过实验分析了横模结构对被动调Q稳定性的影响,设计了角锥棱镜高斯输出镜非稳腔,在显著提高器件光束质量的同时,明显改善了被动调Q的稳定性,并保证了谐振腔的机械稳定性。在此基础上研制了一台重复频率20 Hz、单脉冲能量64 mJ、脉冲宽度7 ns、稳定性优于±5％、光束发散角0.6 mrad、光光效率9.1％,且光轴指向稳定的工程实用器件。

Two Nd∶YAG rods are opposed and offset pumped by two half-cylinder laser diode array for uniform pumping and heat releasing, to improve the laser beam quality and output stability of the passively Q-switched laser side-pumped by laser diode under transfer cooling conditions. The effect of transverse-mode structure on passively Q-switched stability is experimentally studied. An unstable corner-cube prism-Gaussian output mirror cavity is studied. The laser beam quality of the device is improved greatly, as well as the passively Q-switched laser stability, and the mechanical stability of resonator. A practical engineering instrument with high stability and high beam quality is developed, with repetition frequency of 20 Hz, single-pulse energy of 64 mJ, pulse width of 7 ns, stability better than ±4.5%, beam divergence of 0.6 mrad, and optical-optical efficiency of 9.1%.