Kang Zhijun, Fan Zhongwei, Huang Yutao, Zhang Hongbo, Ge Wenqi, Li Mingshan, Yan Xiaochao, Zhang Guoxin
Opt Express. 2018 Mar 19;26(6):6560-6571. doi: 10.1364/OE.26.006560.
We present a high-repetition-rate, high-pulse-energy, high-beam-quality, and high-average-power laser system using an ultraclean closed-type stimulated-Brillouin-scattering phase-conjugate mirror (SBS-PCM). By controlling microparticles of SBS-PCM down to 40 nm, thermal load capacity of such closed-type SBS-PCM was greatly improved, which presented the best reported cleanliness. The closed-type SBS-PCM, lacking scanning wedge plates, achieved reflectivity as high as 92% and showed no optical breakdown phenomena or obvious thermal effects at a 500 Hz pulse-repetition frequency (PRF). Operation at 550 W output power, approximately 1.1 J pulse energy, and beam quality M of approximately 2 represents, to our knowledge, the best reported performance. Thermal phase distortion was compensated, and the maximum-output-power pulse-width compression improved from 30 ns to approximately 10 ns.
我们展示了一种使用超净封闭型受激布里渊散射相位共轭镜（SBS-PCM）的高重复率、高脉冲能量、高光束质量和高平均功率激光系统。通过将SBS-PCM的微粒控制至40纳米以下，这种封闭型SBS-PCM的热负载能力得到了极大提高，呈现出目前报道的最佳清洁度。这种没有扫描楔形板的封闭型SBS-PCM，在500赫兹脉冲重复频率（PRF）下实现了高达92%的反射率，且未出现光学击穿现象或明显的热效应。据我们所知，在550瓦输出功率、约1.1焦耳脉冲能量和约2的光束质量M条件下运行，代表了目前报道的最佳性能。热相位畸变得到了补偿，最大输出功率脉冲宽度从30纳秒压缩至约10纳秒。
