25 September 2014 Controllable focal spot for direct-drive laser fusion based on electro-optic effect
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In direct-drive laser fusion, the sufficient uniformity of focal spot for realizing high efficient compression and central ignition is required. However, the laser beams are difficult to achieve sufficient uniform for compressing the shell symmetrically inward. We proposed a novel scheme to achieve controllable focal length based on electro-optic effect. The electro-optic crystal was placed in the front of the laser fusion system and applied the electro field with approximate spherical distribution. Since the wavefront of laser beam is transformed through the electro-optic crystal, the focal spot of the transformed laser beam would be changed on the target. Theoretical analysis and numerical simulation have been made, and the results show that the proposed scheme could achieve enough controllable focal spot on the target.
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Zheqiang Zhong, Zheqiang Zhong, Xiaochun Hu, Xiaochun Hu, Zelong Li, Zelong Li, Rong Ye, Rong Ye, Bin Zhang, Bin Zhang, "Controllable focal spot for direct-drive laser fusion based on electro-optic effect", Proc. SPIE 9192, Current Developments in Lens Design and Optical Engineering XV, 91921H (25 September 2014); doi: 10.1117/12.2063427; https://doi.org/10.1117/12.2063427

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