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3ω laser damage of fused silica optics is the bottleneck of high power laser systems for ICF. Excellent beam quality plays an important role in improving the anti-damage capability of final optics system. We have developed a new optical field measurement technology based on computational optical imaging. With the high power laser prototype of SGII-UP facility, damage resistance of final optics was experimentally studied. The near filed of laser beam was measured with a high resolution to study the effects of modulation and propagation on laser damage. The near field improvement of high power laser beam are reported and the influence of near filed quality on damage performance of final optics are discussed. The development of the defect detection techniques of final optics are introduced. Finally, we present the development perspective of final optics system for ICF laser driver. At present, the damage resistance capability of final optics assembly is 6J/cm2 at normal operation, we will continue to improve the ability in the next step of work.
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Jianqiang Zhu, Mingying Sun, Zhaoyang Jiao, Yajing Guo, Chong Liu, Xingchen Pan, Hua Tao, Cheng Liu, Xuejie Zhang, Xue Dong, Bei Cheng, "Key issues of damage resistance of final optics for ICF high power laser facility," Proc. SPIE 10898, High Power Lasers for Fusion Research V, 1089807 (13 March 2019); https://doi.org/10.1117/12.2509689