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为了实现在高重复频率调Q的同时,又有好的光束质量。实验设计了激光二极管抽运的高重复频率、高功率的主功率放大(MOPA)结构激光器,激光器采用声-光调Q,主振荡功率放大+二级放大的结构。优化了主功率放大(MOPA)激光器的结构和相关参数,完成了关于高功率高重频主功率放大(MOPA)结构激光器的实验研究,并且通过合理排列光学元件在谐振腔中的位置来实现光束质量的提高,利用聚焦镜和狭缝来实现激光模式的匹配。在重复频率为50 k Hz时,实现了最高功率为51.3 W,输出脉宽为18.62 ns,光束质量为M_X~2=1.882、M_Y~2=1.971的激光输出,光-光转换效率为23.75%。在增益导引的作用下,主振荡功率放大(MOPA)激光器的输出光光束质量得到了有效的提高。
In order to achieve high repetition rate Q-tune at the same time, there is a good beam quality. Experimental design of the laser diode pumping high repetition rate, high power main power amplifier (MOPA) structure of the laser, the laser using the acousto-optic Q, the main oscillator power amplifier + two amplifier structure. The structure and related parameters of the MOPA laser were optimized, and experimental studies on the MOPA laser with high power and high power were completed. The laser beam was achieved by arranging the optical elements in the cavity properly. Improve the quality, the use of focusing mirrors and slits to achieve laser mode matching. When the repetition frequency is 50 k Hz, the laser output with the highest power of 51.3 W, the output pulse width of 18.62 ns and the beam quality of M_X ~ 2 = 1.882 and M_Y ~ 2 = 1.971 is achieved. The light-to-light conversion efficiency is 23.75% . Under the guidance of gain, the output optical beam quality of the main oscillator power amplifier (MOPA) laser is effectively improved.