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采用双激光二极管阵列(LDA)侧面交错抽运Nd∶YAG晶体,通过电光调Q的方式获得1064 nm动态脉冲激光输出。这种抽运结构可以使晶体内的增益场与谐振腔基模实现良好的匹配,易于得到良好的光束质量和大能量输出。抽运源采用峰值功率为100 W的准连续LDA,采用直接贴近抽运的方式,KD*P晶体作为电光Q开关。并应用高斯光束传输的ABCD定律,计算了谐振腔稳区范围,给出了较为合理的谐振腔参数。所设计的激光器在重复频率20 Hz,抽运能量1200 mJ时,获得了最大输出能量151 mJ,脉宽8.48 ns的1064 nm动态激光输出,光-光转换效率为12.6%。
The Nd: YAG crystal was alternately pumped by double laser diode array (LDA), and the 1064 nm dynamic pulse laser output was obtained by electro-optic Q-switching. This pumping structure allows a good match between the gain field in the crystal and the fundamental mode of the resonator, resulting in good beam quality and large energy output. The pumping source uses a quasi-continuous LDA with a peak power of 100 W, with a direct proximity to the pump, KD * P crystal as the electro-optic Q switch. By applying the ABCD law of Gaussian beam transmission, the range of the stable range of the resonant cavity is calculated, and a more reasonable resonant cavity parameter is given. The designed laser has 1064 nm dynamic laser output with maximum output energy of 151 mJ and pulse width of 8.48 ns at a repetition frequency of 20 Hz and a pumping energy of 1200 mJ, with a light-to-light conversion efficiency of 12.6%.