【摘要】 基于新的激光聚变驱动装置的需要,设计了全孔径背向散射诊断光学系统并介绍了光学设计中涉及的若干关键技术。采用低反射率的楔形反射镜衰减背向散射光能量,降低后继元件对光学薄膜损伤阈值的要求。通过缩束镜缩小光束口径,减小光学元件尺寸;同时采取折叠光路结构来缩小系统体积。对空间滤波器和光学滤片进行组合,屏蔽了打靶倍频光干扰及不同散射类型的相互串扰。采用光学白板对色散严重的背向散射光进行漫反射匀化,使光谱测量系统获得完整的光谱信息。最后,选取抛物面为空间分布成像目标面,通过分析空间分布成像光束的结构设计了成像镜头。设计的诊断光学系统具有散射时间测量、光谱测量、空间分布成像、能量测量等功能,光学测量模块尺寸为1.9m×0.9m×1.5m。该全孔径背向散射诊断光学系统在新的激光聚变驱动装置中具有潜在的应用价值。更多还原

【Abstract】 An optical system for full aperture backscatter diagnose was designed for a novel inertial confinement fusion facility.Several key technologies about optical design were discussed.A wedge mirror with low reflectance was used to attenuate the backscatter lights before diagnosis,so the films of optical elements in the diagnostic system were survived after many shots.A telescope optical system was used to reduce the sizes of the beam as well as the sizes of the optical elements,meanwhile the optical path was folded several times by mirrors to shrink the volume of the whole system.The space filter,dichroic filter,optical filters and colored glasses were combined to simultaneously eliminate the stray light.Moreover,a scatter plate was taken to average the signals to ensure the fiber coupler to obtain needed signals including all wavelengths studied.Based on the analysis of imaging beam structures,a lens was designed for the imaging of parabolic mirror,and a camera was used to record the space distribution of scattered lights on the surface of parabolic mirror.The diagnosis system wasdesigned to provide measurements for scattering time,scattering spectrum,near-field imaging,and scattered energy and its whole sizes are 1.9m×0.9m×1.5m.The full aperture backscatter system designed in this paper has potential applications to the new inertial confinement fusion facility.更多还原