17 December 2014 Research of beam conditioning technologies on SG-III laser facility
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Proceedings Volume 9293, International Optical Design Conference 2014; 92930E (2014) https://doi.org/10.1117/12.2073238
Event: International Optical Design Conference, 2014, Kohala Coast, Hawaii, United States
Abstract
Multi-FM SSD and CPP was experimentally studied in high fluence and will be equipped on all the beams of SG-III laser facility. The output spectrum of the cascade phase modulators are stable and the residual amplitude modulation is small. FM-to-AM effect caused by free-space propagation after using smoothing by spectral dispersion is theoretically analyzed. Results indicate inserting a dispersion grating in places with larger beam aperture could alleviate the FM-to- AM effect, suggesting minimizing free-space propagation and adopting image relay. Experiments taken on SG-III laser facility indicate when the number of color cycles (Nc) adopts 1, imposing of SSD with 3.3 times diffraction limit (TDL) did not lead to pinhole closure in the spatial filters of the preamplifier and main amplifier with 30-TDL pinhole size. The nonuniformity of the focal spot using Multi-FM SSD and CPP drops to 0.26, comparing to 0.84 only using CPP. The experiments solve some key technical problems using SSD and CPP on SG-III laser facility, and provide a flexible platform for laser-plasma interaction experiments. Combined beam smoothing and polarization smoothing are also analyzed. Simulation results indicate through adjusting dispersion directions of one-dimensional SSD beams in a quad, two-dimensional SSD could be obtained. The near field and far field properties of beams using polarization smoothing were also studied, including birefringent wedge and polarization control plate (PCP). By using PCP, cylindrical vector beams could be obtained. New solutions will be provided to solve the LPI problem encountered in indirect drive laser fusion.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rui Zhang, Jingqin Su, Haoyu Yuan, Ping Li, Xiaocheng Tian, Jianjun Wang, Jun Dong, Ying Zhang, Qiang Yuan, Yuancheng Wang, Wei Zhou, Zhitao Peng, Fang Wang, Dongxia Hu, Qihua Zhu, Wanguo Zheng, and Xiaomin Zhang "Research of beam conditioning technologies on SG-III laser facility", Proc. SPIE 9293, International Optical Design Conference 2014, 92930E (17 December 2014); doi: 10.1117/12.2073238; https://doi.org/10.1117/12.2073238
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