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通过数值模拟研究了高功率激光驱动器的光束均匀辐照情况, 分析了三倍频激光辐照下小焦斑的光强分布及空间功率谱. 采用透镜列阵可降低光束近场畸变的影响并控制靶面焦斑的包络形状; 采用二维光谱色散匀滑技术可明显地消除焦斑内部大反衬度的强度调制, 且该方法在焦斑非常小的情况下也仍然有效. 大量的数值模拟结果表明, 光谱色散匀滑技术应用于尺寸不同的焦斑时, 其效果是有差异的. 对大焦斑而言, 光谱色散匀滑主要抹平其内部细密的条纹, 即消除中高空间频率范围的强度调制; 对小焦斑而言, 光谱色散匀滑主要消除中低空间频率范围的强度调制, 故将影响焦斑的整体包络形状. 本文所得的数值结果对间接驱动实验中激光束匀滑方案的选择和优化具有参考价值.The performances of the smoothing of small target spots with a lens array (LA) and two-dimensional smoothing by spectral dispersion (2D SSD) in frequency-tripled high-power laser driver are numerically studied. Intensity distributions and spatial power spectra of the spots are analyzed. Simulative results show that LA can reduce the near-field nonuniformity of the beam and control the envelope of on-target intensity distribution. The 2D SSD has obvious effects in eliminating high-contrast intensity modulation, even in the case that the spots are very small. The results indicate that SSD mainly smoothes the intensity modulation at low-to-middle spatial frequency for small spots, and this would lead to the modifying of the spot profile, while for large spots, SSD sweeps the fine speckle structure to reduce nonuniformity at middle-to-high frequency. These results are valuable for choosing the suitable beam smoothing method in indirect-drive experiment.
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Keywords:
- high-power laser driver /
- uniform irradiation /
- lens array /
- smoothing by spectral dispersion
[1] Skupsky S, Lee K 1983 J. Appl. Phys. 54 3662
[2] Jiang S E, Zhang B H, Liu S Y, Yang J M, Sun K X, Huang T X, Ding Y K, Zheng Z J 2007 Scientia Sinica G 37 502 (in Chinese) [江少恩, 张保汉, 刘慎业, 杨家敏, 孙可煦, 黄天晅, 丁永坤, 郑志坚 2007 中国科学G辑 37 502]
[3] Lin Y, Kessler T J, Lawrence G N 1995 Opt. Lett. 20 764
[4] Liu Q, Wu R, Zhang X B, Li Y P, Tian Y C 2008 Chinese J. Lasers 35 1165 (in Chinese) [刘强, 邬融, 张晓波, 李永平, 田杨超 2008 中国激光 35 1165]
[5] Lin Y, Kessler T J, Lawrence G N 1996 Opt. Lett. 21 1703
[6] Tan Q F, Yan Y B, Jin G F, Wu M X 2001 Optics and Lasers in Engineering 35 165
[7] Deng X, Liang X, Chen Z, Yu W, Ma R 1986 Appl. Opt. 25 377
[8] Skupsky S, Short R W, Kessler T, Craxton R S, Letzring S, Soures J M 1989 J. Appl. Phys. 66 3456
[9] Skupsky S, Craxton R S 1999 Phys. Plasmas 6 2157
[10] Miyaji G, Miyanaga N, Urushihara S, Suzuki K, Matsuoka S, Nakatsuka M 2002 Opt. Lett. 27 725
[11] Regan S P, Marozas J A, Craxton R S, Kelly J H, Donaldson W R. Jaanimagi P A, Jacobs-Perkins D, Keck R L, Kessler T J, Meyerhofer D D, Sangster T C, Seka W, Smalyuk V A, Skupsky S, Zuegel J D 2005 J. Opt. Soc. Am. B 22 9982
[12] Haynam C A, Wegner P J, Auerbach J M, Bowers M W, Dixit S N, Erbert G V, Heestand G M, Henesian M A, Hermann M R, Jancaitis K S, Manes K R, Marshall C D, Mehta N C, Menapace J, Moses E, Murray J R, Nostrand M C, Orth C D, Patterson R, Sacks R A, Shaw M J, Spaeth M, Sutton S B, Williams W H, Widmayer C C, White R K, Yang S T, VanWonterghem B M 2007 Appl. Opt. 46 3276
[13] Zhou S, Zhu J, Li X, Lin Z, Dai Y 2006 Chinese J. Lasers 33 321 (in Chinese) [周申蕾, 朱俭, 李学春, 林尊琪, 戴亚平 2006 中国激光 33 321]
[14] Cheng W Y, Zhang X M, Su J Q, Zhao S Z, Li P, Dong J, Zhou L D 2009 J. Opt. A: Pure Appl. Opt. 11 015709
[15] Jiang X J, Zhou S L, Lin Z Q, Zhu J 2006 Acta Phys. Sin. 55 5824 (in Chinese) [江秀娟, 周申蕾, 林尊琪, 朱俭 2006 物理学报 55 5824]
[16] Jiang X J, Zhou S L, Lin Z Q 2007 J. Appl. Phys. 101 023109
[17] Li J H, Zhang H J, Zhou S L, Feng W, Zhu J, and Lin Z Q 2010 Acta Optica Sinica 30 827 (in Chinese) [李菁辉, 张琥杰, 周申蕾, 冯伟, 朱俭, 林尊琪 2010 光学学报 30 827]
[18] Zhang B, Lv B D, Xiao J 1998 Acta Phys. Sin. 47 1998 (in Chinese) [张彬, 吕百达, 肖峻 1998 物理学报 47 1998]
[19] Zhang R, Su J Q, Wang J J, Liu L Q, Li P, Jing F, Zhang X M, Xu L X, Ming H 2011 Appl. Opt. 50 687
[20] Lehmberg R H, Rothenberg E 2000 J. Appl. Phys. 87 1012
[21] Siegman A E 1986 Lasers 1st ed. (California: University Science Books) p630
[22] Goodman J W 1968 Introduction to Fourier Optics 1st ed. (San Francisco: Mcgraw-hill Book Company) p83
[23] Nishi N, Jitsuno T, Nakatsuka M, Nakai S 1998 Opt. Rev. 5 285
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[1] Skupsky S, Lee K 1983 J. Appl. Phys. 54 3662
[2] Jiang S E, Zhang B H, Liu S Y, Yang J M, Sun K X, Huang T X, Ding Y K, Zheng Z J 2007 Scientia Sinica G 37 502 (in Chinese) [江少恩, 张保汉, 刘慎业, 杨家敏, 孙可煦, 黄天晅, 丁永坤, 郑志坚 2007 中国科学G辑 37 502]
[3] Lin Y, Kessler T J, Lawrence G N 1995 Opt. Lett. 20 764
[4] Liu Q, Wu R, Zhang X B, Li Y P, Tian Y C 2008 Chinese J. Lasers 35 1165 (in Chinese) [刘强, 邬融, 张晓波, 李永平, 田杨超 2008 中国激光 35 1165]
[5] Lin Y, Kessler T J, Lawrence G N 1996 Opt. Lett. 21 1703
[6] Tan Q F, Yan Y B, Jin G F, Wu M X 2001 Optics and Lasers in Engineering 35 165
[7] Deng X, Liang X, Chen Z, Yu W, Ma R 1986 Appl. Opt. 25 377
[8] Skupsky S, Short R W, Kessler T, Craxton R S, Letzring S, Soures J M 1989 J. Appl. Phys. 66 3456
[9] Skupsky S, Craxton R S 1999 Phys. Plasmas 6 2157
[10] Miyaji G, Miyanaga N, Urushihara S, Suzuki K, Matsuoka S, Nakatsuka M 2002 Opt. Lett. 27 725
[11] Regan S P, Marozas J A, Craxton R S, Kelly J H, Donaldson W R. Jaanimagi P A, Jacobs-Perkins D, Keck R L, Kessler T J, Meyerhofer D D, Sangster T C, Seka W, Smalyuk V A, Skupsky S, Zuegel J D 2005 J. Opt. Soc. Am. B 22 9982
[12] Haynam C A, Wegner P J, Auerbach J M, Bowers M W, Dixit S N, Erbert G V, Heestand G M, Henesian M A, Hermann M R, Jancaitis K S, Manes K R, Marshall C D, Mehta N C, Menapace J, Moses E, Murray J R, Nostrand M C, Orth C D, Patterson R, Sacks R A, Shaw M J, Spaeth M, Sutton S B, Williams W H, Widmayer C C, White R K, Yang S T, VanWonterghem B M 2007 Appl. Opt. 46 3276
[13] Zhou S, Zhu J, Li X, Lin Z, Dai Y 2006 Chinese J. Lasers 33 321 (in Chinese) [周申蕾, 朱俭, 李学春, 林尊琪, 戴亚平 2006 中国激光 33 321]
[14] Cheng W Y, Zhang X M, Su J Q, Zhao S Z, Li P, Dong J, Zhou L D 2009 J. Opt. A: Pure Appl. Opt. 11 015709
[15] Jiang X J, Zhou S L, Lin Z Q, Zhu J 2006 Acta Phys. Sin. 55 5824 (in Chinese) [江秀娟, 周申蕾, 林尊琪, 朱俭 2006 物理学报 55 5824]
[16] Jiang X J, Zhou S L, Lin Z Q 2007 J. Appl. Phys. 101 023109
[17] Li J H, Zhang H J, Zhou S L, Feng W, Zhu J, and Lin Z Q 2010 Acta Optica Sinica 30 827 (in Chinese) [李菁辉, 张琥杰, 周申蕾, 冯伟, 朱俭, 林尊琪 2010 光学学报 30 827]
[18] Zhang B, Lv B D, Xiao J 1998 Acta Phys. Sin. 47 1998 (in Chinese) [张彬, 吕百达, 肖峻 1998 物理学报 47 1998]
[19] Zhang R, Su J Q, Wang J J, Liu L Q, Li P, Jing F, Zhang X M, Xu L X, Ming H 2011 Appl. Opt. 50 687
[20] Lehmberg R H, Rothenberg E 2000 J. Appl. Phys. 87 1012
[21] Siegman A E 1986 Lasers 1st ed. (California: University Science Books) p630
[22] Goodman J W 1968 Introduction to Fourier Optics 1st ed. (San Francisco: Mcgraw-hill Book Company) p83
[23] Nishi N, Jitsuno T, Nakatsuka M, Nakai S 1998 Opt. Rev. 5 285
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