多路高功率激光系统功率平衡技术研究
文献类型：学位论文
| 作者 | 陆海丰 |
| 学位类别 | 硕士 |
| 答辩日期 | 2014 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 杨琳 |
| 关键词 | 高功率激光 功率平衡 能量平衡 半波片 功率不平衡度 |
| 其他题名 | Research on Power Balance technique of Multi-Beam High Power Laser System |
| 中文摘要 | 激光驱动器的输出能力和精密化水平是实现惯性约束核聚变（ICF）点火必不可少的两项前提条件。ICF不仅对辐照靶面的激光能量均衡性而且对任意时刻的功率平衡性都有很高的要求，因此功率平衡是多路激光驱动器精密化升级改造的重要环节。本文主要研究了组合阵列式多程放大结构激光驱动器功率平衡的一套实现流程，就其中的关键问题展开了以下研究工作： 1. 调研了国内外主要大型激光驱动器装置的功率平衡实现方法，为实验装置的功率平衡提供参考和借鉴。 2. 定义了功率平衡的评价指标，给出了能量离散度和功率不平衡度的计算方法。对影响系统功率不平衡度各因素进行分析，为系统优化及改进提供参考。另外，从脉冲激光放大的速率方程出发，得出一般情况下速率方程的解，对实验用矩形脉冲做单独分析，得出矩形脉冲放大的特性，以及矩形脉冲多程放大的迭代算法。 3. 提出了一套适用于组合阵列式多程放大激光装置的功率平衡实现流程。通过半波片组合衰减装置结合脉冲波束整形和脉冲同步来实现功率平衡，并对系统多个模块提出技术指标和改进意见，为功率平衡的实现和指标的提高提供保障。 4. 开发了相应的计算机自动控制程序，可以实现功率平衡控制全程自动化，同时程序能够统计计算出多路束间或单路多发次间的输出能量分布和功率平衡分布情况。 5. 通过实验结果验证这套功率平衡实现流程的可用性、准确性，最终实现了基频激光输出能量5000J，脉宽3.6ns时半高宽平均功率不平衡度5%RMS，全脉宽平均功率不平衡度8.5%RMS，符合预期目标。 |
| 英文摘要 | The output level of capability and precision level of the high power laser driver are the two essential prerequisite to achieve inertial confinement fusion (ICF) ignition. ICF has a high requirement for uniformity of the irradiation target surface and power balance at any time, so the power balance is an important part of the precision upgrade of the multi-beam laser driver. This paper mainly studied an implementation process of power balance on the group structure of multi-pass amplification laser driver power, carried out the following research work on the key issues: 1. The major domestic and foreign large laser device driver power balance implementation process are investigated. The investigative result can provide reference for the power balance test device. 2. The power balance evaluation is defined, the calculation method of the energy dispersion and power imbalance are gave out. Analysis of the factors affecting the system power imbalance to provide reference for system optimization and improvement. Based on the one-dimensional laser amplification basic physical model, solution of rate equations is obtained. Especially for the rectangular pulse, pulse amplification characteristics is obtained, as well as iterative algorithm of multipass amplification. 3. An implementation process of power balance that adapted to the multi-pass amplification laser device is proposed, and has used on the device. Through an assemble of a half-wave plate and polarizers to achieve the energy balance, and achieved pulse time-domain synchronization by adjusting the optical path difference. And suggest improvements to the system multiple modules, to provide protection for the power balance to achieve and improve indicators. 4. Corresponding development program is developed, that can achieve full automation power balance control, it also can calculate distribution of multi-beam or single beam multiple times energy and power balance. 5. Finally，we achieve the expected goal of the power imbalance that the fundamental frequency laser output energy was 5000J, pulse width was 3.6ns. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16870]  |
| 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 | 陆海丰. 多路高功率激光系统功率平衡技术研究[D]. 中国科学院上海光学精密机械研究所. 2014. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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