神光Ⅲ远场诊断系统光学设计及关键技术研究

【作者】 李东明；

【导师】 陈军；

【作者基本信息】 浙江大学 ， 光学工程， 2004， 硕士

【摘要】 对神光Ⅲ远场诊断系统进行了光学设计，给出了系统各组件的评价结果及各光学元件的像差结果。设计了大口径椭球凹面取样镜，理论上实现了对焦斑的无像差取样，最终给出了对设计结果的加工可行性报告。 针对神光Ⅲ波前畸变检测系统所用的光源，设计了脉冲氙灯泵浦的YAG电光调Q固体激光器系统，对激光器的组成原理以及系统各部件的作用和实现途径进行了详细论述，阐述了设计的思想，并叙述了激光器的安装及调试过程，最终获得了脉宽10ns、重复频率为1Hz、能量200mJ以上的激光输出实验结果。 提出了利用特殊液体的受激布里渊散射（SBS）现象来改善固体激光器的光束质量，并在理论和实验上给予证实。针对液体SBS过程的打火花现象，设计了SBS液池循环过滤系统，对液体内的杂质进行自动的循环过滤，并把系统应用于LD泵浦的MOPA系统中，给出了应用该液池系统所得的激光脉冲输出实验结果。 论文最后一部分是对LD泵浦的微片固体激光器所进行的理论分析和实验研究，主要论述了两个部分的内容：LD泵浦的掺Cr⁴⁺的Nd：YAG被动调Q微片激光器，得到了6ns、10kHz的自调Q脉冲激光输出；LD泵浦的Nd³⁺：YVO₄增益开关微片激光器，获得了具有增益调Q特性的脉宽80ns～16ns、重复频率1Hz～4kHz短脉冲激光输出。更多还原

【Abstract】 The laser far-field diagnose system in ShenGuang III is designed, and the evaluation for each module of the system and the optical aberration of each element is presented. A big calibers mirror with the elliptical sphere surface is designed, theoretically realized to sample with the focus spot have no aberration, and the processing possibility report of the design is also presented.In allusion to the light source used in the wavefront distortion detection system of the ShenGuang III, the pulses Xe-light pumped YAG solid laser system with the electrical optical Q-switch is designed. The composing principle of the laser system and the function of each part are expounded, as well as the realized way. The designed thought is expatiated, while the assemble and adjust of the laser system is described. With such setup, the laser output with 10ns pulse width, IHz frequency and 200mJ output energy is obtained.Utilizing the Stimulated Brillouin Scattering (SBS) phenomenon in especial liquid to improve the beam quantity of the solid-state laser is validated in the theory and the experiment. In allusion to "spark-over phenomenon" in the liquid SBS process, the circulated filter system for SBS liquid cell is designed, so the impurity inside the liquid can be percolated automatically and circulating. Apply this system in the MOPA system of LD pumped the laser, the experimental results for applied the liquid’s cell system are presented.The last part of the thesis is the theoretical analysis and the experimental research on LD pumped microchip laser, including two parts:The LD pumped Cr4+:Nd:YAG passive Q-switched microchip lasers, with pulse width of 6 ns,10 KHz frequency, passive Q-switched pulse laser output is obtained.The LD pumped Nd3+: YVO4 gain-switched lasers, with pulse width 80-16ns, 10 KHz frequency, gain-switched short pulses lasers output is obtained.更多还原