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为满足惯性约束聚变(ICF)系统中,对焦斑均匀辐照的条件,研究了连续位相板(CPP)面形特征对远场光斑质量的影响.从波动光学和几何光学两个不同的角度建立分析模型,并利用均方根梯度这一参数将其统一起来.利用所建立的分析模型,通过数值计算研究了CPP面形均方根梯度对低频畸变光束的匀滑效果.结果表明:随着CPP均方根梯度增大,匀滑后的远场焦斑半径增大;光束顶部不均匀性先很快减小,再缓慢降低,最后趋于不变,可见CPP对光束的匀滑效果明显;束匀滑过程对能量利用率的影响先几乎不变,然后逐渐减小.当CPP的相关长度不变,均方根梯度在0.20.8 wave/mm范围内时,光斑尺寸、光束顶部不均匀性及能量利用率都在较好的范围.In order to satisfy uniform irradiation requirement in inertial confinement fusion(ICF) system, the influence of surface characteristics of continuous phase plate on beam quality is studied in this paper. Based on wave optics and geometrical optics, theoretical analysis model is established, respectively. And the parameter, root mean square gradient, is used to unify both theoretical models. Meanwhile, the smoothing effects of root mean square phase gradient of continuous phase plate on laser beam with low-frequency aberrant wavefront are simulated. Numerical simulations show that the radius of focus spot will increase with the increase of root mean square phase gradient of continuous phase plate, and nonuniformity of beam top will decrease quickly, then reduce slowly and tend to be unchanged finally. So smoothing effect of continuous phase plate is obvious. In addition, energy availability factor has little change, then decreases gradually and reduces slowly. Spot size, nonuniformity of beam top and energy availability factor are all in a good range when the correlation length of continuous phase plate is not changed and root mean square gradient is 0.20.8 wave/mm.
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Keywords:
- continuous phase plate(CPP) /
- root mean square phase gradient(GRMS) /
- beam smoothing /
- focal spot
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[10] Zhan J H, Yao X, Gao F H, Yang Z J, Zhang Y X, Guo Y K 2011 Acta Phys. Sin. 60 014205(in Chinese) [占江徽、姚 欣、高福华、阳泽健、张怡霄、郭永康 2011 60 014205]
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[28] [29] Deng X, Liang X, Chen Z, Yu W 1986 Appl. Opt. 25 377
[30] Wen S L, Xu Q, Ma P, Yang C L, Zhou L S, Yan H 2009 Acta Optica Sinica 29 3179 (in Chinese) [温圣林、许 乔、马 平、杨春林、周礼书、颜 浩 2009 光学学报29 3179]
[31] [32] [33] Marozas J A 2007 J. Opt. Soc. Am. A 24 74
[34] Williams W, Auerbach J, Hunt J, Lawson L, Manes K, Orth C,Sacks R, Trenholme J, Wegner P 1997 LLNL Technical Report
[35] [36] Lin Z X, Zhang R Z, Yang C L, Xu Q. 2010 High Power Laser and Particle Beams 22 2634 (in Chinese) [林中校、张蓉竹、杨春林、许 乔 2010 强激光与粒子束 22 2634]
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[1] Li P, Ma C, Su J Q, Cheng W Y, Liu L Q, Wang W Y, Mo L, Zhou L D 2008 High Power Laser and Particle Beams 20 1114 (in Chinese) [李 平、马 驰、粟敬钦、程文雍、刘兰琴、王文义、莫 磊、周丽丹 2008 强激光与粒子束20 1114]
[2] [3] Enzo Di Fabrizio, Dan Cojoc, Stefano Cabrini, Burkhard Kaulich, Jean Susini, Paolo Facci, Thomas Wilhein 2003 Opt. Exp. 11 2278
[4] [5] Zapata-Rodrguezl C J, Caballero M T 2007 Opt. Lett. 32 2472
[6] Wei S B, Bu J, Zhu S W, Yuan X C 2011 Chin. Opt. Lett. 9 031001
[7] [8] [9] Yao X, Gao F H, Zhang Y X, Wen S L, Guo Y K, Lin X D 2009 Acta Phys. Sin. 58 3130(in Chinese)[姚 欣、高福华、张怡霄、温圣林、郭永康、林祥棣 2009 58 3130]
[10] Zhan J H, Yao X, Gao F H, Yang Z J, Zhang Y X, Guo Y K 2011 Acta Phys. Sin. 60 014205(in Chinese) [占江徽、姚 欣、高福华、阳泽健、张怡霄、郭永康 2011 60 014205]
[11] [12] [13] Yao X, Gao F H, Gao B, Zhang Y X, Huang L X, Guo Y K, Lin X D 2009 Acta Phys. Sin. 58 4598(in Chinese)[姚 欣、高福华、高 博、张怡霄、黄利新、郭永康、林祥棣 2009 58 4598]
[14] [15] Li J L, L B D 2008 Acta Phys. Sin. 57 3006(in Chinese)[李建龙、吕百达 2008 57 3006]
[16] [17] Kato Y, Mima K, Miyanaga N, Arinaga S, Kitagawa Y, Nakatsuka M 1984 Phys. Revi. Letts. 53 1057
[18] Dixit S N, Lawson J K, Manes K R, Powell H T, Nugent K A 1994 Opt.Lett. 19 417
[19] [20] [21] Kessler T J, Lin Y, Armstrong J J, Velazquez B 1993 SPIE 1870
[22] Lin Y, Kessler T J, Lawrence G N 1995 Opt. Lett. 20 764
[23] [24] [25] Lin Y, Kessler T J, Lawrence G N 1996 Opt. Lett. 21 1703
[26] [27] Yang C L, Zhang R Z, Xu Q, Ma P 2008 Appl. Opt. 47 1465
[28] [29] Deng X, Liang X, Chen Z, Yu W 1986 Appl. Opt. 25 377
[30] Wen S L, Xu Q, Ma P, Yang C L, Zhou L S, Yan H 2009 Acta Optica Sinica 29 3179 (in Chinese) [温圣林、许 乔、马 平、杨春林、周礼书、颜 浩 2009 光学学报29 3179]
[31] [32] [33] Marozas J A 2007 J. Opt. Soc. Am. A 24 74
[34] Williams W, Auerbach J, Hunt J, Lawson L, Manes K, Orth C,Sacks R, Trenholme J, Wegner P 1997 LLNL Technical Report
[35] [36] Lin Z X, Zhang R Z, Yang C L, Xu Q. 2010 High Power Laser and Particle Beams 22 2634 (in Chinese) [林中校、张蓉竹、杨春林、许 乔 2010 强激光与粒子束 22 2634]
[37] [38] [39] Goodman J W (Translated by Qin K C, Liu P S, Chen J 2006 Introduction to Fourier Optics Third Edition (Beijing: Publishing House of Electronics Industry) pp5153 (in Chinese) [顾德曼Joseph W著 秦克城、刘培森、陈家璧、曹其智译 2006 傅里叶光学导论 第三版(北京;电子工业出版社)第5153页]
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