超短超强激光系统中光谱整形和系统同步问题研究
文献类型：学位论文
| 作者 | 陆效明 |
| 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 | 冷雨欣 |
| 关键词 | 超强超短激光 CPA 增益窄化 光谱展宽 时间同步 |
| 其他题名 | Researches on Spectrum Shaping and System Sychronization in ultra-short and ultra-intense laser system |
| 中文摘要 | 超短超强激光技术自上世纪八十年代兴起到现在，已经取得了长足的发展，并且为众多学科领域提供了前所未有的实验手段和极端实验条件。本论文以本实验室的自建的钛宝石啁啾脉冲放大(Chirped Pulse Amplification, CPA)系统为基础，针对钛宝石CPA激光系统中的出现的几个关键的技术问题：如何有效克服脉冲放大过程中固有的增益窄化以及如何使系统中各路光脉冲信号在时间上达到精确同步获得宽带高能量增益展开理论和实验的研究。主要研究内容包括以下几点： 1． 设计了石英双折射片用以抑制前端再生放大器内的增益窄化。在简化的双折射片单次透过率的理论计算公式基础上提出了精确计算公式，同时给出了详细的设计方法。把根据设计制作的石英双折射片插入再生腔中，再生放大器输出的脉冲谱宽与设计的模拟计算结果相符。通过后续的多通放大器放大后，放大光谱由无双折射片时约28nm(FWHM)，展宽到了约62nm。最后输出10Hz的压缩脉冲宽度达到约23fs。 2． 设计了一套新型的多路激光脉冲同步装置，将该同步装置运用到钛宝石CPA激光系统中，使种子光与Nd:glass单纵模泵浦激光器在时间精确同步，时间同步的精度达到了ns量级，使种子光在钛宝石CPA激光系统中的最后一级功率放大器内得到有效的高能量放大。 3． 在以上工作的基础上,参加高能量钛宝石CPA激光系统搭建，以及脉冲压缩，光束质量测量等工作，并对前端进行了升级和优化的研究，保证了系统稳定运行和后续放大。 |
| 英文摘要 | The ultra-short and ultra-intense laser technologies have made a great progress, which offers novel experimental methods and extreme physical conditions since 1980s. Based on the Ti:sapphire Chirped Pulse Amplification (CPA) laser system built by our laboratory, this dissertation carries out the theorical and experimental researches aimed at the important issues in the Ti:sapphire CPA laser system: how to overcome the intrinsic spectrum gain narrowing in the process of high gain pulse amplification and how to synchronize chirped seed pulse and the pump pulse in the Ti:sapphire CPA laser system precisely. The main research topics include: 1. The quartz birfringent plate (BP) is designed to reduce the spectrum gain narrowing effect in the regenerative amplifier. A precise theorical single transmission formula of the plate is presented on the base of the simplified formula. The details about how to design a quartz BP are also displayed. With the fabricated BP according our design inserting into the regenerative cavity，the amplified spectrum in the regenerative amplifier is broadened effectively, and the experimental results agrees with the simulation well. The broadening spectrum of the amplified pulse is about 62 nm (FWHM) against the original 28nm after the following amplifier. And the final 10Hz compressed pulse has a duration of about 23 fs. 2. A novel signal synchronizer about multiplex laser pulses is designed. This device is applied in the Ti:sapphire CPA laser system to synchronize the seed pulse and the Nd:glass single-longitudinal-mode pump laser precisely. The time synchronizing precision is in the scale of ns. The seed pulse is amplified in the final power amplifier in the Ti:sapphire CPA laser system effectively. 3. Based on the above work, I take part in the work of building the front end of the high-power Ti:sapphire CPA laser system, the pulse compression, the beam quality measure of the amplifid pulse. At the same time, for the forrowing effective pulse amplification and the whole laser system running steadily, the reseaches about the upgrade and optimization to the front end is carried out. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16512]  |
| 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 | 陆效明. 超短超强激光系统中光谱整形和系统同步问题研究[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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