非线性调制影响束匀滑相位板离焦性能的研究
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摘要
结合非线性强度和相位调制作用,研究束匀滑相位板整形焦光斑在焦面附近传输变换的特性。采用衍射光学理论方法来计算三维空间离焦面上的光场分布,引入光斑落点漂移和光强对称度两个指标参量来表征光斑在传输演化过程中的性能。研究分析了高通量激光辐照下非线性效应对连续相位板整形焦斑的影响,尤其是楔形透镜厚端和薄端的较大差异引起的小尺度自聚焦强度调制差异,该差异使得光斑传输至焦点后的一段距离后开始渐渐偏离光轴,同时其整体强度分布也出现不对称度偏置。结果表明,非线性强度畸变的影响远大于相位畸变的影响,在给定激光装置光路中5GW/cm2功率密度的入射条件下,焦点后4mm处光斑落点漂移超过0.1mm,光强左右不对称度偏置达到30%。
Transmission characteristics of smoothed beam spots near the focal plane were investigated under the influence of nonlinear intensity and phase modulation.Diffraction theory was used to calculate the light field distribution on the defocused surface in three-dimensional space.Spot position drift and intensity symmetry were used to characterize beam spot performance during transmission evolution.The impact of non-linear effects under high-flux laser irradiation on smoothed spot of continuous phase plate was studied.Especially,the small-scale selffocusing intensity modulation difference caused by large difference between the thick and thin ends of wedge lens resulted in gradual deviation of beam spot from the optical axis during the defocusing transmission process,and caused asymmetric bias of intensity distribution.The results show that the effect of nonlinear intensity distortion is far greater than that of phase distortion.Under irradiation with 5 GW/cm2 power density on a given laser device,the spot position offset is more than 0.1 mm on the 4 mm defocused plane,and the asymmetry of light intensity is biased to 30%.
Transmission characteristics of smoothed beam spots near the focal plane were investigated under the influence of nonlinear intensity and phase modulation.Diffraction theory was used to calculate the light field distribution on the defocused surface in three-dimensional space.Spot position drift and intensity symmetry were used to characterize beam spot performance during transmission evolution.The impact of non-linear effects under high-flux laser irradiation on smoothed spot of continuous phase plate was studied.Especially,the small-scale selffocusing intensity modulation difference caused by large difference between the thick and thin ends of wedge lens resulted in gradual deviation of beam spot from the optical axis during the defocusing transmission process,and caused asymmetric bias of intensity distribution.The results show that the effect of nonlinear intensity distortion is far greater than that of phase distortion.Under irradiation with 5 GW/cm2 power density on a given laser device,the spot position offset is more than 0.1 mm on the 4 mm defocused plane,and the asymmetry of light intensity is biased to 30%.
引文
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[22]Chen B S,Zhang J Y,Zhang Y L,et al.Study of small-scale self-focusing in high-power laser system[J].Laser&Optoelectronics Progress,2012,49(1):010002.陈宝算,张军勇,张艳丽,等.高功率激光系统中的小尺度自聚焦研究[J].激光与光电子学进展,2012,49(1):010002.
[23]Li B,Hu X Y,Zheng C Y,et al.Numerical simulation of filamentation for spatially smoothing beam in hohlraum[J].High Power Laser and Particle Beams,2016,28(11):112004.李斌,胡晓燕,郑春阳,等.黑腔中空间束匀滑光束成丝不稳定性的数值模拟[J].强激光与粒子束,2016,28(11):112004.
[24]Wang W L.Study on fast focal zooming technology for direct-drive fusion[J].Journal of Lanzhou University of Arts and Science(Natural Sciences),2015,29(5):30-36.王文莲.用于直接驱动的快速可变焦技术研究[J].兰州文理学院学报(自然科学版),2015,29(5):30-36.
[25]Shao P,Xia L,Zhao D F,et al.Measurement and debugging of wedge-shaped lens in high power laser facility[J].Chinese Journal of Lasers,2015,42(4):0408006.邵平,夏兰,赵东峰,等.高功率激光装置终端楔形透镜的测量与调试[J].中国激光,2015,42(4):0408006.
[2]Zhou S L,Zhu J,Li X C,et al.Experimental study of smoothing by spectral dispersion[J].Chinese Journal of Lasers,2006,33(3):321-325.周申蕾,朱俭,李学春,等.光谱色散平滑的实验研究[J].中国激光,2006,33(3):321-325.
[3]Li P,Su J Q,Ma C,et al.Effect of smoothing by spectral dispersion on the spatial spectrum of focal spot[J].Acta Physica Sinica,2009,58(9):6210-6215.李平,粟敬钦,马驰,等.光谱色散匀滑对焦斑光强频谱的影响[J].物理学报,2009,58(9):6210-6215.
[4]Li T F,Hou P C,Zhang B.Parameters optimization for radial smoothing based on optical Kerr effect[J].Acta Optica Sinica,2016,36(11):1114002.李腾飞,侯鹏程,张彬.基于光克尔效应的径向匀滑方案参数优化[J].光学学报,2016,36(11):1114002.
[5]Zheng T R,Zhang Y,Geng Y C,et al.Smoothing by spectral dispersion technology based on bundle multiple-frequency modulation[J].Chinese Journal of Lasers,2017,44(12):1205003.郑天然,张颖,耿远超,等.基于集束多频调制的光谱色散匀滑技术[J].中国激光,2017,44(12):1205003.
[6]Xiao J,LüB D.Characteristics of polarization control plate smoothing interference speckles[J].Chinese Journal of Lasers,2000,27(7):627-632.肖峻,吕百达.偏振控制板对干涉斑纹的匀滑特性[J].中国激光,2000,27(7):627-632.
[7]Deng X M,Liang X C,Chen Z Z,et al.Uniform illumination of large targets using a lens array[J].Applied Optics,1986,25(3):377-381.
[8]Kato Y,Mima K,Miyanaga N,et al.Random phasing of high-power lasers for uniform target acceleration and plasma-instability suppression[J].Physical Review Letters,1984,53(11):1057-1060.
[9]Dixit S N,Nugent K A,Lawson J K,et al.Kinoform phase plates for focal plane irradiance profile control[J].Optics Letters,1994,19(6):417-419.
[10]Lin Y,Lawrence G N,Kessler T J.Distributed phase plates for super-Gaussian focal-plane irradiance profiles[J].Optics Letters,1995,20(7):764-766.
[11]Shu F J,Jia T J.Analysis of the caliber tolerance of phase plate[J].Journal of Zhongzhou University,2009,26(3):113-116.舒方杰,贾廷见.位相片口径宽容性分析[J].中州大学学报,2009,26(3):113-116.
[12]Wu R,Hua N,Zhang X B,et al.Large-diameter multi-level diffractive optical elements with high energy efficiency[J].Acta Physica Sinica,2012,61(22):224202.邬融,华能,张晓波,等.高能量效率的大口径多台阶衍射光学元件[J].物理学报,2012,61(22):224202.
[13]Lin Y,Lawrence G N,Kessler T J.Design of continuous surface-relief phase plates by surfacebased simulated annealing to achieve control of focalplane irradiance[J].Optics Letters,1996,21(20):1703-1705.
[14]Marozas J A.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].Journal of the Optical Society of America A,2007,24(1):74-83.
[15]Chen B,Wang H Z,Wei H,et al.Design of fully continuous phase plates for beam smoothing in ICF[J].Acta Optica Sinica,2001,21(4):480-484.陈波,王菡子,韦辉,等.用于惯性约束聚变束匀滑的完全连续相位板设计方法[J].光学学报,2001,21(4):480-484.
[16]Yang C,Zhang R,Xu Q,et al.Continuous phase plate for laser beam smoothing[J].Applied Optics,2008,47(10):1465-1469.
[17]Zhang R,Li P,Su J Q,et al.Experimental research of target uniform illumination using smoothing by spectral dispersion and continuous phase plate[J].Acta Physica Sinica,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.
[18]Zhang W W,Peng X Q,Shi F.Research on manufacturing of constant phase plate with magnetorheological finishing techniques[J].Aviation Precision Manufacturing Technology,2010,46(5):20-22,30.张伟伟,彭小强,石峰.连续相位板的磁流变加工技术研究[J].航空精密制造技术,2010,46(5):20-22,30.
[19]Wen S L,Xu Q,Ma P,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.
[20]Wen S C,Fan D Y.Filamentation of intense laser beam in high power laser and the B integral[J].Acta Optica Sinica,2001,21(11):1331-1335.文双春,范滇元.高功率激光放大器中光束的成丝和B积分[J].光学学报,2001,21(11):1331-1335.
[21]Li K,Zhang B,Li K Y,et al.Nonlinear selffocusing by intense UV laser infused silica[J].High Power Laser and Particle Beams,2006,18(10):1653-1656.李琨,张彬,李恪宇,等.熔石英介质中强紫外激光自聚焦效应研究[J].强激光与粒子束,2006,18(10):1653-1656.
[22]Chen B S,Zhang J Y,Zhang Y L,et al.Study of small-scale self-focusing in high-power laser system[J].Laser&Optoelectronics Progress,2012,49(1):010002.陈宝算,张军勇,张艳丽,等.高功率激光系统中的小尺度自聚焦研究[J].激光与光电子学进展,2012,49(1):010002.
[23]Li B,Hu X Y,Zheng C Y,et al.Numerical simulation of filamentation for spatially smoothing beam in hohlraum[J].High Power Laser and Particle Beams,2016,28(11):112004.李斌,胡晓燕,郑春阳,等.黑腔中空间束匀滑光束成丝不稳定性的数值模拟[J].强激光与粒子束,2016,28(11):112004.
[24]Wang W L.Study on fast focal zooming technology for direct-drive fusion[J].Journal of Lanzhou University of Arts and Science(Natural Sciences),2015,29(5):30-36.王文莲.用于直接驱动的快速可变焦技术研究[J].兰州文理学院学报(自然科学版),2015,29(5):30-36.
[25]Shao P,Xia L,Zhao D F,et al.Measurement and debugging of wedge-shaped lens in high power laser facility[J].Chinese Journal of Lasers,2015,42(4):0408006.邵平,夏兰,赵东峰,等.高功率激光装置终端楔形透镜的测量与调试[J].中国激光,2015,42(4):0408006.