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Studies on design of 351 nm focal plane diagnostic system prototype and focusing characteristic of SGII-upgraded facility at half achievable energy performance

机译：351 nm焦平面诊断系统原型的设计和SGII升级设施在可达到的一半能量性能下的聚焦特性的研究

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In order to obtain the intensity distribution of a 351 nm focal spot and smoothing by spectral dispersion (SSD) focal plane profile of a SGII-upgraded facility, a type of off-axis imaging system with three spherical mirrors, suitable for a finite distance source point to be imaged near the diffraction limit has been designed. The quality factor of the image system is 1.6 times of the diffraction limit tested by a 1053 nm point source. Because of the absence of a 351 nm point source, we can use a Collins diffraction imaging integral with respect to lambda = 351 nm, corresponding to a quality factor that is 3.8 times the diffraction limit at 351 nm. The calibration results show that at least the range of +/- 10 mrad of view field angle and +/- 50 mm along the axial direction around the optimum object distance can be satisfied with near diffraction limited image that is consistent with the design value. Using this image system, the No. 2 beam of the SGII-upgraded facility has been tested. The test result of the focal spot of final optics assembly (FOA) at 351 nm indicates that about 80% of energy is encompassed in 14.1 times the diffraction limit, while the output energy of the No. 2 beam is 908 J at 1053 nm. According to convolution theorem, the true value of a 351 nm focal spot of FOA is about 12 times the diffraction limit because of the influence of the quality factor. Further experimental studies indicate that the RMS value along the smoothing direction is less than 15.98% in the SSD spot test experiment. Computer simulations show that the quality factor of the image system used in the experiment has almost no effect on the SSD focal spot test. The image system can remarkably distort the SSD focal spot distribution under the circumstance of the quality factor 15 times worse than the diffraction limit. The distorted image shows a steep slope in the contour of the SSD focal spot along the smoothing direction that otherwise has a relatively flat top region around the focal spot center. (C) 2016 Optical Society of America
机译：为了获得351 nm焦斑的强度分布并通过SGII升级设施的光谱色散（SSD）焦平面轮廓进行平滑处理，这种离轴成像系统具有三个球面镜，适用于有限距离光源设计了接近衍射极限的成像点。图像系统的质量因子是1053 nm点光源测试的衍射极限的1.6倍。由于不存在351 nm点光源，因此我们可以使用λ= 351 nm的Collins衍射成像积分，其质量因数是351 nm衍射极限的3.8倍。校准结果表明，与设计值一致的近衍射极限图像可以满足至少+/- 10 mrad的视场角范围和沿着轴向的+/- 50 mm的最佳物距。使用该图像系统，对SGII升级设施的2号光束进行了测试。最终光学组件（FOA）的焦点在351 nm处的测试结果表明，在衍射极限的14.1倍中包含约80％的能量，而2号光束的输出能量在1053 nm处为908J。根据卷积定理，由于品质因数的影响，FOA 351 nm焦点的真实值约为衍射极限的12倍。进一步的实验研究表明，在SSD点测试实验中，沿平滑方向的RMS值小于15.98％。计算机仿真表明，实验中使用的图像系统的品质因数对SSD焦点测试几乎没有影响。在质量因数比衍射极限差15倍的情况下，图像系统可使SSD焦点分布明显变形。扭曲的图像显示了SSD焦点轮廓沿平滑方向的陡峭斜率，否则在焦点中心周围具有相对平坦的顶部区域。 （C）2016美国眼镜学会

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