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A new scheme of spectral dispersion smoothing based on hybrid grating

Wang Jian Hou Peng-Cheng Zhang Bin

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A new scheme of spectral dispersion smoothing based on hybrid grating

Wang Jian, Hou Peng-Cheng, Zhang Bin
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  • The irradiance uniformity on target plane is a key issue in laser-driven inertial confinement facilities. In the typical schemes of one-dimensional smoothing by spectral dispersion (1D-SSD) and the “star” grating, the stripe pattern inside the focal spot appears inevitably, besides, the fabrication of the “star” grating is relatively difficult. Thus, a new spectral dispersion smoothing scheme based on a hybrid grating is proposed, which not only achieves the better smoothing effect, but also exhibits some specific advantages in the fabrication and the dispersion way. According to the different direction of the spectral dispersion, the hybrid grating is divided into inner and outer dispersion areas. That is, the dispersion direction of the inter dispersion area is in the horizontal or vertical direction, and the dispersion direction of the outer dispersion area is in the azimuthal direction. When the laser beam with the temporal phase modulation propagates through the hybrid grating, the dispersion directions of the laser beam in the inner and the outer dispersion areas are different, leading to the redistribution of the speckles inside the focal spot in the resultant direction of the translation and rotation on the target plane. Consequently, the focal spot on the target plane achieves the beam smoothing in radial and horizontal or vertical direction. In the present paper, the theoretical model of the hybrid grating scheme based on the spectral dispersion smoothing is built up. Using the theoretical model, the smoothing effect of the hybrid grating scheme is analyzed, and compared with those of the typical schemes of 1D-SSD and the “star” grating. The contrast and the fractional power above the intensity (FOPAI) are used to evaluate the smoothing characteristic of the focal spot. In addition, the influences of the area ratio and groove density in the different dispersion areas of the hybrid grating on beam-smoothing effect are also discussed. Results indicate that when the inner dispersion area accounts for the 0.3-0.5 of the total dispersion area, the hybrid grating scheme can effectively suppress the stripe intensity modulation both in the radial direction and the vertical direction. With increasing the groove densities of the inner and the outer dispersion area in a certain range, the irradiance uniformity of the focal spot is further improved. However, considering the actual processing of the hybrid grating, the appropriate groove density should be selected. Compared with the typical scheme of the 1D-SSD, the scheme of the hybrid grating can achieve the better smoothing effect with the multi-direction spectral dispersion smoothing. Furthermore, the fabrication of the hybrid grating is relatively simple and the irradiation uniformity on the target plane is also good compared with those of the “star” grating scheme.
      Corresponding author: Zhang Bin, zhangbinff@sohu.com
    • Funds: Project supported by the Basic Research Program of the National Major Project of China (Grant No. JG2015034) and the China Innovative Talent Promotion Plans for Innovation Team in Priority Fields (Grant No. 2014RA4051).
    [1]

    Zhong Z Q, Hu X C, Li Z L, Ye R, Zhang B 2015 Acta Phys. Sin. 64 054209 (in Chinese)[钟哲强, 胡小川, 李泽龙, 叶荣, 张彬2015物理学报64 054209]

    [2]

    Weng S L, Yan H, Zhang Y H, Yang C L, Wang J, Shi Q K 2014 Acta Opt. Sin. 34 154(in Chinese)[温圣林, 颜浩, 张远航, 杨春林, 王健, 石琦凯2014光学学报34 154]

    [3]

    Desselberger M, Willi O 1993 Phys. Plasmas 05 896

    [4]

    Smalyuk V A, Boehly T R, Bradley D K, Goncharov V N, Delettrez J A, Knauer J P, Meyerhofer D D, Oron D, Shvarts D 1998 Phys. Rev. Lett. 81 5342

    [5]

    Skupsky S, Short R W, Kessler T, Craxton R S, Letzring S, Soures J M 1989 J. Appl. Phys. 66 3456

    [6]

    Rothenberg J E, Moran B D, Henesian M A, Wonterghem B M V 1996 Second International Conference on Solid State Lasers for Application to ICF Paris, France, October 22, 1997 p313

    [7]

    Zhang R, Su J Q, Wang J J, Li P, Dong J, Hu D X 2014 International Optical Design Hawaii, United States, June 22-26, 2014 IM2B. 8

    [8]

    Rothenberg J E 1995 Proc. SPIE 2633 634

    [9]

    Sui Z 2006 Ph. D. Dissertation (Shanghai:Fudan University) (in Chinese)[隋展2006博士学位论文(上海:复旦大学)]

    [10]

    Zhang R, Zhang X, Sui Z, Hai M 2011 Opt. Laser Technol. 43 1073

    [11]

    Zhong Z Q, Zhou B J, Ye R, Zhang B 2014 Acta Phys. Sin. 63 035201(in Chinese)[钟哲强, 周冰洁, 叶荣, 张彬物理学报2014 63035201]

    [12]

    Li J C 2008 Ph. D. Dissertation (Mianyang:China Academy of Engineering Physics) (in Chinese)[李锦灿2008博士学位论文(绵阳:中国工程物理研究院)]

    [13]

    Yang B, Li Z Y, Xiao X 2013 Acta Phys. Sin. 62 184214 (in Chinese)[杨彪, 李智勇, 肖希2013物理学报62 184214]

    [14]

    Li Y Y, Liu L S, Wang T F, Shao J F, Guo J 2015 Infrared Laser Eng. 44 857 (in Chinese)[李远洋, 刘立生, 王挺峰, 邵俊峰, 郭劲2015红外与激光工程44 857]

    [15]

    Wen P, Li Z L, Zhong Z Q, Zhang B 2015 Acta Opt. Sin. 35 167(in Chinese)[文萍, 李泽龙, 钟哲强, 张彬2015光学学报35 167]

    [16]

    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, Patterso R N, Sacks R A, Shaw M J, Spaeth M, Sutton S B, Williams W H, Widmaye C C, White R K, Yang S T, Wonterghem B M 2007 Appl. Opt. 46 3276

    [17]

    Wisoff P J, Bowers M W, Erbert G V, Browning D F, Jedlovec D R 2004 Proc. SPIE 5341 146

    [18]

    Hou P C, Zhong Z Q, Zhang B 2016 Opt. Laser Technol. 85 48

  • [1]

    Zhong Z Q, Hu X C, Li Z L, Ye R, Zhang B 2015 Acta Phys. Sin. 64 054209 (in Chinese)[钟哲强, 胡小川, 李泽龙, 叶荣, 张彬2015物理学报64 054209]

    [2]

    Weng S L, Yan H, Zhang Y H, Yang C L, Wang J, Shi Q K 2014 Acta Opt. Sin. 34 154(in Chinese)[温圣林, 颜浩, 张远航, 杨春林, 王健, 石琦凯2014光学学报34 154]

    [3]

    Desselberger M, Willi O 1993 Phys. Plasmas 05 896

    [4]

    Smalyuk V A, Boehly T R, Bradley D K, Goncharov V N, Delettrez J A, Knauer J P, Meyerhofer D D, Oron D, Shvarts D 1998 Phys. Rev. Lett. 81 5342

    [5]

    Skupsky S, Short R W, Kessler T, Craxton R S, Letzring S, Soures J M 1989 J. Appl. Phys. 66 3456

    [6]

    Rothenberg J E, Moran B D, Henesian M A, Wonterghem B M V 1996 Second International Conference on Solid State Lasers for Application to ICF Paris, France, October 22, 1997 p313

    [7]

    Zhang R, Su J Q, Wang J J, Li P, Dong J, Hu D X 2014 International Optical Design Hawaii, United States, June 22-26, 2014 IM2B. 8

    [8]

    Rothenberg J E 1995 Proc. SPIE 2633 634

    [9]

    Sui Z 2006 Ph. D. Dissertation (Shanghai:Fudan University) (in Chinese)[隋展2006博士学位论文(上海:复旦大学)]

    [10]

    Zhang R, Zhang X, Sui Z, Hai M 2011 Opt. Laser Technol. 43 1073

    [11]

    Zhong Z Q, Zhou B J, Ye R, Zhang B 2014 Acta Phys. Sin. 63 035201(in Chinese)[钟哲强, 周冰洁, 叶荣, 张彬物理学报2014 63035201]

    [12]

    Li J C 2008 Ph. D. Dissertation (Mianyang:China Academy of Engineering Physics) (in Chinese)[李锦灿2008博士学位论文(绵阳:中国工程物理研究院)]

    [13]

    Yang B, Li Z Y, Xiao X 2013 Acta Phys. Sin. 62 184214 (in Chinese)[杨彪, 李智勇, 肖希2013物理学报62 184214]

    [14]

    Li Y Y, Liu L S, Wang T F, Shao J F, Guo J 2015 Infrared Laser Eng. 44 857 (in Chinese)[李远洋, 刘立生, 王挺峰, 邵俊峰, 郭劲2015红外与激光工程44 857]

    [15]

    Wen P, Li Z L, Zhong Z Q, Zhang B 2015 Acta Opt. Sin. 35 167(in Chinese)[文萍, 李泽龙, 钟哲强, 张彬2015光学学报35 167]

    [16]

    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, Patterso R N, Sacks R A, Shaw M J, Spaeth M, Sutton S B, Williams W H, Widmaye C C, White R K, Yang S T, Wonterghem B M 2007 Appl. Opt. 46 3276

    [17]

    Wisoff P J, Bowers M W, Erbert G V, Browning D F, Jedlovec D R 2004 Proc. SPIE 5341 146

    [18]

    Hou P C, Zhong Z Q, Zhang B 2016 Opt. Laser Technol. 85 48

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Publishing process
  • Received Date:  11 May 2016
  • Accepted Date:  25 July 2016
  • Published Online:  05 October 2016

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