最小空间周期对连续相位板加工和性能的影响
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摘要
最小空间周期是连续位相板(CPP)设计和加工过程中的重要特征参数。根据惯性约束聚变大型激光驱动装置的需求,建立不同空间周期的CPP设计与分析方法,研究了不同最小空间周期对磁流变加工和焦斑性能的影响。结果表明,磁流变加工的去除函数尺寸直接与CPP的最小空间周期成线性关系,而加工去除量与最小空间周期的平方根成线性关系,最小周期越大,加工越容易,但加工量越大;焦斑整形性能受最小空间周期的影响小,能量集中度差异小于0.2%,但焦斑顶部均匀性随着最小空间周期变小而变好,5 mm最小周期CPP的焦斑顶部不均匀比15 mm的CPP小3.5%。因此,设计时应尽量减小最小空间周期,但选取的最小空间周期不能大于加工设备的约束条件。
Least spatial period is an important parameter for the design and fabrication of continuous phase plate(CPP). Based on the requirement of laser facility for inertial confinement fusion, a method of design and analysis for CPP with different least spatial periods is built up. The effects of least spatial period on the fabrication and performance of continuous phase plate have been studied. The results show that the removal function size is linearly correlated to the least spatial period, and the relationship between the removal and the square root of least spatial period is about linear, so the fabrication with larger least spatial period should be easier because the CPP has more medium-high frequency, but it has more material to be removed. Moreover, the beam shaping performance of CPP is rarely influenced by the least spatial period, the difference of capacity usage ratio caused by different CPP is smaller than 0.2%. But the uniformity of top focal spot caused by CPP becomes more excellent when the least spatial period is minimized, the nonuniformity of least spatial period CCP of 5 mm is 3.5% less than that of 15 mm. So the selected least spatial period should be minimized, while it can't exceed the ability of the fabricating equipment.
Least spatial period is an important parameter for the design and fabrication of continuous phase plate(CPP). Based on the requirement of laser facility for inertial confinement fusion, a method of design and analysis for CPP with different least spatial periods is built up. The effects of least spatial period on the fabrication and performance of continuous phase plate have been studied. The results show that the removal function size is linearly correlated to the least spatial period, and the relationship between the removal and the square root of least spatial period is about linear, so the fabrication with larger least spatial period should be easier because the CPP has more medium-high frequency, but it has more material to be removed. Moreover, the beam shaping performance of CPP is rarely influenced by the least spatial period, the difference of capacity usage ratio caused by different CPP is smaller than 0.2%. But the uniformity of top focal spot caused by CPP becomes more excellent when the least spatial period is minimized, the nonuniformity of least spatial period CCP of 5 mm is 3.5% less than that of 15 mm. So the selected least spatial period should be minimized, while it can't exceed the ability of the fabricating equipment.
引文
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2 Ji Lailin,Liu Cong,Zhu Baoqiang,et al..Analysis of influence of beam smoothing on third harmonic generation in SG II update[J].Acta Optica Sinica,2013,33(12):1219002.季来林,刘崇,朱宝强,等.神光II升级系统中束匀滑对三倍频的影响分析[J].光学学报,2013,33(12):1219002.
3 J Neauport,X Ribeyre,J Daurios,et al..Design and optical characterization of a large continuous phase plate for laser integration line and laser megajoule facilities[J].Appl Opt,2003,42(13):2377-2382.
4 Zhang Rui,Li Ping,Su Jingqin,et al..Experiment research of target uniform illumination using smoothing by spectral dispersion and continuous phase plate[J].Acta Phys Sin,2012,61(5):054204.张锐,李平,粟敬钦,等.采用光谱色散平滑和连续相位板实现靶面均匀辐照的实验研究[J].物理学报,2012,61(5):054204.
5 J A Marozas.Fourier transform-based continuous phase-plate design technique:a high-pass phase-plate design as an application for OMEGA and the national ignition facility[J].J Opt Soc Am A,2007,24(1):74-83.
6 Wen Shenglin,Xu Qiao,Ma Ping,et al..Process-based design of continuous phase plates[J].Acta Optica Sinica,2009,29(11):3179-3182.温圣林,许乔,马平,等.基于工艺的连续相位板设计[J].光学学报,2009,29(11):3179-3182.
7 J A Menapace,P J Davis,W A Steele,et al..MRF applications:on the road to making large-aperture ultraviolet laser resistant continuous phase plates for high-power lasers[C].SPIE,2006,6403:64030N.
8 Wen Shenglin,Hou Jing,Yang Chunlin,et al..Design and fabrication of large-aperture continuous phase plates for back lighting[J].Laser&Optoelectronics Progress,2011,48(5):052201.温圣林,侯晶,杨春林,等.用于背光照明的大口径连续相位板设计和制作[J].激光与光电子学进展,2011,48(5):052201.
9 Ji Jianwei,Wei Chaoyang,Hu Chen,et al..A comparison and analysis of removal function based on edge effect with different pressure distribution models[J].Chinese J Lasers,2014,41(12):1216002.吉建伟,魏朝阳,胡晨,等.不同压力模型下边缘去除函数对比分析[J].中国激光,2014,41(12):1216002.
10 Li Ping,Ma Chi,Su Jingqin,et al..Analysis of laser optimized spectrum for smoothing the focused spot by temporal and special method[J].Chinese J Lasers,2008,35(4):534-538.李平,马驰,粟敬钦,等.时域与空域结合实现光束匀滑的光谱优化分析[J].中国激光,2008,35(4):534-538.
11 J A Menapace,S N Dixit,F Y Genin,et al..Magnetorheological finishing for imprinting continuous phase plate structure onto optical surfaces[C].SPIE,2003,5273:220.
12 J D Lindl,P Amendt,R L Berger,et al..The physics basis for ignition using indirect-drive targets on the national ignition facility[J].Physics of Plasmas,2004,11(2):339-491.
13 D H Froula,L Divol,R A London,et al..Experimental basis for laser-plasma interactions in ignition hohlraums at the national ignition facility[J].Physics of Plasmas,2010,17(5):056302.
14 C A Haynam,P J Wegner,J M Auerbach,et al..National ignition facility laser performance status[J].Appl Opt,2007,46(16):3276-3233.
15 Zhang Feng.Combined type polishing of silicon modification layer on silicon carbide mirror for space camera[J].Chinese J Lasers,2013,40(7):0716001.张峰.空间相机碳化硅反射镜表面硅改性层的组合式抛光[J].中国激光,2013,40(7):0716001.
16 Wen Shenglin,Yan Hao,Zhang Yuanhang,et al..Calculation and experiment of the focal spot caused by continuous phase plate with incident wavefront distortion[J].Acta Optica Sinica,2014,34(3):0314001.温圣林,颜浩,张远航,等.波前畸变下连续相位板焦斑的计算与实验[J].光学学报,2014,34(3):0314001.