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在惯性约束聚变间接驱动装置中,针对柱形腔两端注入结构及其光路排布方案,建立了基于束匀滑技术的激光束传输模型。在此基础上,分析了激光集束在真空柱形腔腔壁上的辐照特性,并根据柱形腔整体腔壁光斑排布特性,对激光集束光路排布进行了初步优化。结果表明,随着入射角度的增加,激光集束在腔壁的光斑尺寸逐渐变小,而其在腔壁上的热斑比例无明显变化,偏振特性也基本保持一致。通过进一步分析所有激光集束在腔壁上的强度分布和热斑比例可知,内、外环激光集束在腔壁上的交叠区域将增大局部峰值强度,提高热斑比例。可以通过适当调节内环激光集束的焦面位置和入射角度来改善所有激光集束在腔壁上的辐照特性。
In the inertial confinement fusion indirect actuator, a beam transmission model based on the beam smoothing technique is established for the injection structure of the cylindrical cavity at both ends and its optical path arrangement. On this basis, the irradiation characteristics of laser beam focusing on vacuum cylindrical cavity wall were analyzed. The arrangement of laser beam path was preliminarily optimized according to the characteristic of the cavity wall spot distribution. The results show that with the increase of incident angle, the spot size of laser converging on the cavity wall gradually decreases, while the proportion of hot spots on the cavity wall does not change significantly and the polarization characteristics are basically the same. By further analyzing the intensity distribution and the hot spot ratio of all the laser bundles on the cavity wall, it can be seen that the overlapping area of the inner and outer ring laser beams on the cavity wall will increase the local peak intensity and increase the hot spot ratio. It is possible to improve the irradiance characteristics of all the laser bundles on the cavity wall by appropriately adjusting the focal plane position and angle of incidence of the inner laser beam bundle.