“强度扫动”光束匀滑特性的理论研究
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摘要
理论阐述了光谱色散匀滑(SSD)技术的物理内涵,即SSD的焦斑匀滑效果来源于远场基元电场相位随时间的演化,在实际应用中不存在"运动"焦斑的物理图像。在此基础上,建立了远场强度分布形式不变但空间位置随时间变化的"强度扫动"光束的理论模型,通过数值模拟研究其匀滑特性,并与SSD的匀滑效果进行了对比分析。
The physical content of smoothing by spectral dispersion(SSD)technology is theoretically explained that the focal spot smoothing effect of SSD results from the temporal change of the far-field primitive electric field phase,and there is no physical image of "moving" focal spot in the practical application of SSD.On this basis,the theoretical model of "intensity sweep" laser beam,which has a far-field intensity distribution with constant form but temporal changed spatial position,is established.The smoothing characteristics of the beam are studied by numerical simulation compared with that of SSD.
The physical content of smoothing by spectral dispersion(SSD)technology is theoretically explained that the focal spot smoothing effect of SSD results from the temporal change of the far-field primitive electric field phase,and there is no physical image of "moving" focal spot in the practical application of SSD.On this basis,the theoretical model of "intensity sweep" laser beam,which has a far-field intensity distribution with constant form but temporal changed spatial position,is established.The smoothing characteristics of the beam are studied by numerical simulation compared with that of SSD.
引文
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[2]Cola6tis A,Duchateau G,Ribeyre X,et al.Coupled hydrodynamic model for laser-plasma interaction and hot electron generation[J].Physical Review E,2015,92(4):041101.
[3]Hüller S,Masson-Laborde P E,Pesme D,et al.Harmonic decomposition to describe the nonlinear evolution of stimulated Brillouin scattering[J].Physics of Plasmas,2006,13(2):022703.
[4]Raj G,Hüller S.Impact of laser beam speckle structure on crossed beam energy transfer via beam deflections and ponderomotive self-focusing[J].Physical Review Letters,2017,118(5):055002.
[5]Cola6tis A,Hüller S,Pesme D,et al.Crossed beam energy transfer:assessment of the paraxial complex geometrical optics approach versus a time-dependent paraxial method to describe experimental results[J].Physics of Plasmas,2016,23(3):032118.
[6]Haynam C A,Wegner P J,Auerbach J M,et al.National ignition facility laser performance status[J].Applied Optics,2007,46(16):3276-3303.
[7]Spaeth M L,Manes K R,Bowers M,et al.National ignition facility laser system performance[J].Fusion Science and Technology,2016,69(1):366-394.
[8]Walraet F,Riazuelo G,Bonnaud G.Propagation in a plasma of a laser beam smoothed by longitudinal spectral dispersion[J].Physics of Plasmas,2003,10(3):811-819.
[9]Zhang R,Jia H T,Tian X C,et al.Research of beam conditioning technologies using continuous phase plate,multi-FM smoothing by spectral dispersion and polarization smoothing[J].Optics and Lasers in Engineering,2016,85:38-47.
[10]Marozas J A,Collins T J B,Zuegel J D,et al.Continuous distributed phase-plate advances for highenergy laser systems[J].Journal of Physics:Conference Series,2016,717:012107.
[11]Yang C L,Yan H,Wang J,et al.A novel design method for continuous-phase plate[J].Optics Express,2013,21(9):11171-11180.
[12]Wen S L,Yan H,Zhang Y H,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.
[13]Wen S L,Tang C X,Zhang Y H,et al.Effects of least spatial period on the fabrication and performance of continuous phase plate[J].Chinese Journal of Lasers,2015,42(9):0908001.温圣林,唐才学,张远航,等.最小空间周期对连续相位板加工和性能的影响[J].中国激光,2015,42(9):0908001.
[14]Skupsky S,Short R W,Kessler T,et al.Improved laser-beam uniformity using the angular dispersion of frequency-modulated light[J].Journal of Applied Physics,1989,66(8):3456-3462.
[15]Jiang X J,Tang Y F,Wang L,et al.Performance of smoothing by spectral dispersion with consideration of the gain characteristic of Nd∶glass amplifier[J].Acta Physica Sinica,2017,66(12):124204.江秀娟,唐一凡,王利,等.考虑钕玻璃放大器增益特性的光谱色散匀滑系统性能研究[J].物理学报,2017,66(12):124204.
[16]Miyaji G,Miyanaga N,Urushihara S,et al.Threedirectional spectral dispersion for smoothing of a laser irradiance profile[J].Optics Letters,2002,27(9):725-727.
[17]Hohenberger M,Shvydky A,Marozas J A,et al.Optical smoothing of laser imprinting in planar-target experiments on OMEGA EP using multi-FM 1-Dsmoothing by spectral dispersion[J].Physics of Plasmas,2016,23(9):092702.
[18]Li B,Liu Z J,Hao L,et al.Accomplishment of numerical simulation for a SSD beam propagation in a large scale plasma[J].Chinese Journal of Lasers,2017,44(12):1201004.李斌,刘占军,郝亮,等.谱色散匀滑化光束空间大尺度传输过程的模拟实现[J].中国激光,2017,44(12):1201004.
[19]Dixit S N,Munro D,Murray J R,et al.Polarization smoothing on the National Ignition Facility[J].Journal de Physique IV France,2006,133:717-720.
[20]Li Z L,Zhong Z Q,Zhang B.Study on multi-beam superposition using complementary polarization control plates[J].Acta Physica Sinica,2014,63(9):095204.李泽龙,钟哲强,张彬.基于互补型偏振控制板的多光束叠加特性研究[J].物理学报,2014,63(9):095204.
[21]Montgomery D S.Two decades of progress in understanding and control of laser plasma instabilities in indirect drive inertial fusion[J].Physics of Plasmas,2016,23(5):055601.
[22]Li J Z,Yan J X.Fundamentals of optoelectronics[M].Beijing:Beijing Institute of Technology Press,1998:61-62.李家泽,阎吉祥.光电子学基础[M].北京:北京理工大学出版社,1998:61-62.
[23]Spaeth M L,Manes K R,Kalantar D H,et al.Description of the NIF laser[J].Fusion Science and Technology,2016,69(1):25-145.
[24]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.
[25]Li F Q,Han W,Wang F,et al.Research status of final optics assembly in high-power laser facility[J].Laser&Optoelectronics Progress,2013,50(6):060002.李富全,韩伟,王芳,等.高功率激光驱动器终端光学组件研究现状[J].激光与光电子学进展,2013,50(6):060002.