多光束匀滑技术研究

发布时间:2018-04-25 19:00

  本文选题:多光束匀滑 + 互补偿相位板 ; 参考:《西南交通大学》2017年硕士论文


【摘要】:在惯性约束聚变(ICF)实验中,对辐照在黑腔靶丸上的高功率激光的均匀度提出了较为苛刻的条件:平顶,陡边和低旁瓣。因此,如何在ICF中实现靶面上激光的均匀辐照,一直是被国内外专家学者研究的热点。本论文从ICF间接驱动装置中的激光排布出发,研究了互补偿相位板对靶面光强均匀辐照的重大意义,进一步对所有激光束辐照到黑腔内壁上的光强分布进行模拟仿真。论文的工作内容主要包括以下3部分:1.基于标量衍射理论,建立多光束衍射传输的理论模型。详细介绍了互补偿相位板的设计方法及评价参数。利用改进的GS算法和模拟退火算法,理论仿真了互补偿相位板对激光光束均匀度的影响。仿真结果表明相对于普通相位板而言,互补偿相位板能有效的提升远场光斑的均匀度。2.详细研究了互补偿相位板的容差能力。仿真结果表明,互补偿相位板具有更好的容差能力,对具有相同波前畸变的光束而言,通过互补偿相位板得到的远场焦斑的顶部均匀度提升了 62.44%。3.数值仿真了多束激光在黑腔内壁上的光强辐照特性。仿真结果表明:(1)光束不会发生堵孔效应;(2)随着入射角的增加,辐照在黑腔内壁上的光斑逐渐减小;(3)内环单位能量密度较小,黑腔内光强分布均匀性较差。通过调整外环焦斑尺寸使黑腔内壁上的光强分布更加均匀。
[Abstract]:In the inertial confinement fusion (ICF) experiment, the conditions of the uniformity of high power laser irradiated on the black cavity target are presented: flat top, steep edge and low sidelobe. Therefore, how to achieve uniform laser irradiation on the target surface in ICF has always been a hot topic for experts and scholars at home and abroad. In this paper, based on the arrangement of laser in ICF indirect drive device, the significance of mutually compensated phase plate for uniform irradiation of target surface light intensity is studied, and the intensity distribution of all laser beams irradiating to the inner wall of black cavity is simulated. The work of the thesis mainly includes the following three parts: 1. Based on scalar diffraction theory, a theoretical model of multi-beam diffraction propagation is established. The design method and evaluation parameters of mutual compensation phase plate are introduced in detail. Using the improved GS algorithm and simulated annealing algorithm, the effect of mutually compensated phase plate on laser beam uniformity is theoretically simulated. The simulation results show that the mutual compensation phase plate can effectively improve the evenness of far-field spot compared with the ordinary phase plate. The tolerance of mutually compensated phase plates is studied in detail. The simulation results show that the mutually compensated phase plate has better tolerance. For the beam with the same wavefront distortion, the top uniformity of the far-field focal spot obtained by the mutual compensation phase plate has increased by 62.44. 3. The radiation characteristics of multiple laser beams on the inner wall of black cavity are numerically simulated. The simulation results show that there is no hole blocking effect in the beam with the increase of the incident angle, the spot on the inner wall of the black cavity decreases gradually) the unit energy density of the inner ring is smaller, and the distribution uniformity of the light intensity in the black cavity is poor. The light intensity distribution on the inner wall of the black cavity is more uniform by adjusting the size of the focal spot in the outer ring.
【学位授予单位】:西南交通大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TN24

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