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Proceedings Paper

Research of beam conditioning technologies on SG-III laser facility
Author(s): 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; Xiaomin Zhang
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Paper 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.

Paper Details

Date Published: 17 December 2014
PDF: 9 pages
Proc. SPIE 9293, International Optical Design Conference 2014, 92930E (17 December 2014); doi: 10.1117/12.2073238
Show Author Affiliations
Rui Zhang, Research Ctr. of Laser Fusion (China)
Jingqin Su, Research Ctr. of Laser Fusion (China)
Haoyu Yuan, Research Ctr. of Laser Fusion (China)
Ping Li, Research Ctr. of Laser Fusion (China)
Xiaocheng Tian, Research Ctr. of Laser Fusion (China)
Jianjun Wang, Research Ctr. of Laser Fusion (China)
Jun Dong, Research Ctr. of Laser Fusion (China)
Ying Zhang, Research Ctr. of Laser Fusion (China)
Qiang Yuan, Research Ctr. of Laser Fusion (China)
Yuancheng Wang, Research Ctr. of Laser Fusion (China)
Wei Zhou, Research Ctr. of Laser Fusion (China)
Zhitao Peng, Research Ctr. of Laser Fusion (China)
Fang Wang, Research Ctr. of Laser Fusion (China)
Dongxia Hu, Research Ctr. of Laser Fusion (China)
Qihua Zhu, Research Ctr. of Laser Fusion (China)
Wanguo Zheng, Research Ctr. of Laser Fusion (China)
Xiaomin Zhang, Research Ctr. of Laser Fusion (China)


Published in SPIE Proceedings Vol. 9293:
International Optical Design Conference 2014
Mariana Figueiro; Scott Lerner; Julius Muschaweck; John Rogers, Editor(s)

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