高功率激光装置终端光学组件的研究
文献类型：学位论文
| 作者 | 赵东峰 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 朱健强 |
| 关键词 | 高功率激光装置 靶场光学系统 终端光学组件 谐波分离 |
| 其他题名 | Research on the final optics assembly in high power laser facility |
| 中文摘要 | 惯性约束聚变（Inertial Confinement Fusion，ICF）是实现可控热核聚变的一条途径，成为当今国际上的重大基础科研领域，对国防科技和新能源的开发有着重要的科学意义和应用价值。现ICF研究已发展成为包括物理理论、诊断、制靶、物理实验和驱动器等五位一体的综合性研究领域。激光驱动器的研究是其中的关键，它是当今脉冲功率最高、规模最大，因而也最复杂的激光系统。 终端光学组件作为驱动器激光传输链最后的单元，需实现真空密封、谐波转换、色分离、焦斑控制、激光聚焦和激光测量等功能，是复杂的光学系统，成为驱动器发展重要而关键的单元之一。这就需要对终端光学组件进行全面的研究，一方面结合工程研制和物理实验要求，提出组件的基本构成；另一方面对组件进行集成优化分析，由此使组件的功能得到扩展、性能得到提升，更能满足物理实验不断提出的需求，这正是本文开展研究基于的思想。 一、分析终端光学组件的现状和发展趋势，确定其实现的基本功能和构成元件。 终端光学组件是集真空密封、谐波转换、谐波分离、激光聚焦、焦斑控制和激光参数测量等功能于一体，包括了窗口玻璃、倍频晶体、聚焦透镜、衍射光学元件和防溅射板等光学元件，分析实现同一功能的不同光学元件或方式的优缺点。这样，结合工程研制的风险控制和物理实验的要求，可以确定实现一定功能的终端光学组件的基本构成元件。 二、对终端光学组件开展集成优化分析，来提升组件的性能，并为组件的研制提供指导。 终端光学组件的集成优化需考虑的因素为：1、因光学元件表面反射产生的杂散光分布；2、激光高通量传输时光学元件累积的B积分情况；3、高通量激光传输，导致光学元件对激光近场分布的调制；4、各衍射光学元件相互间的影响，以及对倍频晶体转换效率的影响；5、组件结构的稳定性。目前所开展的分析主要为聚焦透镜的“鬼像”分布、组件的B积分累积和实现一定功能的组件结构稳定性分析。 三、根据“神光”II装置第九路系统的实际情况，开展终端光学组件的研制。 应用有限元分析法进行终端光学组件的稳定性动、静分析，来优化设计结构。同时开展基于楔形板实现三倍频谐波分离的实验，该技术的研究对高功率激光装置三倍频谐波分离和精密测量的改进，具有重要的意义。 对终端光学组件的研究，有助于我们全面地寻求单元技术与系统的关系，通过有目的地选择和改进部分单元技术，来实现系统的功能和提高其性能。本论文探讨了高功率激光装置终端光学组件的研究，对提高驱动器激光运行通量具有一定的指导意义。 关键词：高功率激光装置，靶场光学系统，终端光学组件，谐波分离 |
| 英文摘要 | Inertial Confinement Fusion (ICF) is a path to realize the controllable hot nuclear fusion, becomes a significant research field in frontier basic science today, and is of great scientific and applying meaning in national defense and exploiting new energy resource. Now ICF research consists of five parts, which are inertial confinement fusion theory, solid state laser driver, physical diagnoses method and facility, fine target fabrication and overall physics experiments respectively. Laser driver is the pivotal part. The driver provides the pulsed energy so high and the scale so large that it is the most complicated laser systems today. The final optics assembly (FOA), one of important parts of the high power laser facility, is compact optical system to realize many functions about isolating vacuum, converting frequency, focusing laser, dispersing color, beam smoothing and power measurement, and includes three unit-techniques, which are final beam focus and spot shape, harmonic propagating and final laser parameter measure. In order to expand function, advance performance and meet the requirements of physics experiments, the general research of the FOA is about conditioning on the requirement of physics experiments and engineer manufacture to do the basic design, and developing the integrated optimization of assembly. 1. Analyse the actually and the developing current, and confirm the basic function and element of the final optics assembly. The FOA collects many functions about isolating vacuum, converting frequency, focusing laser, dispersing color, beam smoothing and power measurement, and includes many optics elements about vacuum window, frequency conversion crystals, focus lens, diffractive optics and debris shields. There analyses over two ways or elements to realize the same function, but there are excellence and shortcoming. Therefore, a basic element of the FOA to realize some functions can be made sure based on the venture control of engineer manufacture and the requirement of physics experiment. 2. Develop the integrated optimization on the FOA is in order to improve performance and help to assembly manufacture. There are five aspects to optimize on the FOA, include: i, ghost beams in assembly because of surface reflection; ii, B-integral because of beam propagation through the FOA; iii, laser near-field modulation because of high power propagation; iv, effect between diffractive optics and frequency converter; v, the stability of the FOA. There analyze ghost beams of focus lens, B-integral and stability. 3. Based on the actual of the “SG-II” facility, there develops engineer manufacture of the FOA. By using FEM, the static and dynamic states about the main machine components of the FOA and the ICF target chamber have been analyzed and the design of FOA has been optimized. In order to realize the third harmonic propagation at high-power, the experiment based on the combination of wedge window and focus lens is developed. The techniques make very sense to research on the high power propagation and improve on the precision measure. With the research of the FOA, we can take much interesting information in system and unit-technique to realize function and improve capability of the system. In the thesis, we have researched the FOA. In a way, the conclusion has some guiding value to improve power densities of high power laser facility. Key words: high power laser facility, target area system, the final optics assembly, the third harmonic splitter |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16656]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 赵东峰. 高功率激光装置终端光学组件的研究[D]. 中国科学院上海光学精密机械研究所. 2007. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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