直接驱动下光束焦斑控制技术
文献类型：学位论文
| 作者 | 朱应成 |
| 文献子类 | 硕士 |
| 导师 | 周申蕾 |
| 关键词 | G-S算法 G-S algorithm 连续相位板 continuous phase plate 光束匀滑 beam smoothing 动态控制 dynamic control 变焦相位板 zoom phase plate |
| 其他题名 | Technology of controlling focal spot in direct drive ICF |
| 英文摘要 | 惯性约束聚变(ICF)的研究对靶面激光焦斑的光强均匀性、能量集中度等焦斑特性都提出了很高的要求。不同的驱动方式对靶面焦斑有不同的要求，本文以满足直接驱动下的焦斑要求为目标，研究了基于焦斑空间频谱的连续相位板的优化设计，动态控制焦斑的变焦相位板(ZPP)的设计的相关问题，论文的主要工作包含以下几个方面： (1)在传统的连续相位板(CPP)设计方法的基础上提出了改进G-S算法，基于设计目标分步分段控制相位板频谱，改进算法提高了对称焦斑的设计效率，改善了G-S算法可能陷入局部最优的缺点，对于非对称焦斑的设计也有很好的应用，并通过数值模拟验证了改进算法的可行性。 (2)研究了激光辐照均匀性的评价方法，采用参数体系来评价焦斑的均匀性。对比了传统算法和改进算法设计的CPP作用下的焦斑均匀性，分析了ZPP作用下的大小焦斑的均匀性。 (3)分析了应用中影响CPP性能的误差来源，建立了误差数学模型，模拟了各种误差对CPP性能的影响，并通过实验对设计的CPP性能的有效性进行了验证。 (4)基于CPP的设计方法，对ZPP设计进行了研究，建立了ZPP的设计方法模型，在保证大焦斑的均匀性较好的同时，尽量提高小焦斑的均匀性和能量利用率，实现了直接驱动下动态控制焦斑的需求。; The research of inertial confinement fusion (ICF) has put forward high requirements on the focal spot characteristics such as the intensity uniformity and energy concentration of the laser focal spot on the target surface. Different driving methods have different requirements on the focal spot of the target. This paper aims at satisfying the focal spot requirement of direct driving. The optimal design of the continuous phase plate based on the frequency spectrum of the focal spot is studied, and the focal phase of the focal spot is dynamically controlled. The issues related to the design of (ZPP), the main work of the paper includes the following aspects: (1) An improved GS algorithm is proposed based on traditional method of continuous phase plate (CPP) is studied. The spectrum of the phase plate is controlled step by step based on the design goal. The improved algorithm improves the design efficiency of symmetrical focal spot and improves the possibility that the GS algorithm may be trapped. The disadvantage of the local optimum is also well applied to the design of asymmetric focal spot, and the feasibility of the improved algorithm is verified by numerical simulation. (2) The method of evaluating the uniformity of laser irradiation was studied, and the parameter system was used to evaluate the uniformity of the focal spot. The focal spot uniformity under the CPP effect of the traditional algorithm and the improved algorithm design is compared, and the uniformity of the size focal spot under the action of ZPP is analyzed. (3) Analyze the error sources that affect CPP performance in the application, establish the error mathematical model, simulate the impact of various errors on CPP performance, and verify the effectiveness of the designed CPP performance through experiments. (4) Based on the CPP design method, the ZPP design was studied, and a ZPP design method model was established to ensure the uniformity of the small focal spot and the energy efficiency while ensuring the uniformity of the large focal spot is better. The need to dynamically control the focal spot under direct drive is achieved. |
| 学科主题 | 光学工程 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/31081]  |
| 专题 | 中国科学院上海光学精密机械研究所 |
| 作者单位 | 中国科学院上海光学精密机械研究所 |
| 推荐引用方式 GB/T 7714 | 朱应成. 直接驱动下光束焦斑控制技术[D]. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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