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13 October 2010 Improved uniformity of target irradiation by combining an orthogonal cylindrical lens array and the polarization control
Jianzhou Zheng, Wenyang Zheng, Qingxu Yu, Bin Dong, Shouhua Guan, Yunfeng Wu
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Proceedings Volume 7654, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 76540O (2010) https://doi.org/10.1117/12.866696
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China
Abstract
A scheme of combining technology of orthogonal cylindrical lens array (OCLA) and polarization control plate (PCP) is introduced to improve target irradiation uniformity in laser fusion. The feasibility of the scheme is also analyzed by detailed two-dimensional simulation. It shows that a focal pattern with flat-top and sharp-edge profile could be obtained with an OCLA, while interference stripes inside the pattern are smoothed out by the use of the polarization control plate (PCP) technique. Moving the target slightly from the exact focal plane of the principal focusing lens can eliminate middle-scale-length intensity fluctuation further. And a well-irradiated laser spot with small nonuniformity and great energy efficiency can be obtained in this scheme.
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Jianzhou Zheng, Wenyang Zheng, Qingxu Yu, Bin Dong, Shouhua Guan, and Yunfeng Wu "Improved uniformity of target irradiation by combining an orthogonal cylindrical lens array and the polarization control", Proc. SPIE 7654, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 76540O (13 October 2010); https://doi.org/10.1117/12.866696
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KEYWORDS
Polarization control
Polarization
Energy efficiency
Diffraction
Speckle pattern
Modulation
Thermal effects
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