飞秒拍瓦级激光系统研制和性能优化的若干问题研究
文献类型：学位论文
| 作者 | 李闯 |
| 学位类别 | 博士 |
| 答辩日期 | 2008 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 李儒新 |
| 关键词 | 啁啾脉冲放大 飞秒 拍瓦 钛宝石激光 |
| 其他题名 | On several key issues related to the development and optimization of Femtosecond Petawatt-level Ti:sapphire Laser System |
| 中文摘要 | 1985年啁啾脉冲放大技术的发明和1991年钛宝石自锁模激光器的诞生奠定了当今超短超强激光技术的基础。超短超强激光为众多学科领域提供了前所未有的实验手段和极端物理条件，同时各个应用领域又对超短超强激光的性能指标提出越来越高的要求，因此人类追求超短脉冲宽度、超强峰值功率激光脉冲的脚步一刻没有停歇。 尽管光学参量啁啾脉冲放大技术以其增益带宽宽、热效应低、累积B积分小等优势显示了强劲的发展潜力，啁啾脉冲放大技术仍然是目前获取超短超强激光脉冲的主流技术。目前基于啁啾脉冲放大技术的太瓦级激光系统已经商品化，百太瓦级激光系统也在多家实验室和公司变为现实，拍瓦时代也即将来临。 本论文的工作主要在于飞秒拍瓦级激光系统的研制及性能优化研究。论文的主要工作包括超短激光脉冲放大、系统色散补偿、新型预放大器的研制、激光辅助调节系统的开发等几个方面。主要研究成果概括如下： 1. 参与建造了一套10太瓦级钛宝石啁啾脉冲放大系统。通过在再生腔中插入石英双折射滤波片，有效抑制了放大过程中的增益窄化效应；通过优化设计放大器中的泵浦光功率密度，精简了系统规模，节省了成本。最终获得了脉冲宽度23fs，峰值功率17TW的超短激光脉冲输出。 2. 参与了将上述10太瓦级激光系统升级至准拍瓦级激光系统的工作。对利用不匹配展宽压缩系统补偿高阶色散的可行性进行了论证，并提出了进一步优化系统色散补偿能力的建议。 3. 设计并建造了一套多通型预放大器，替代原飞秒拍瓦系统中的再生放大器。测试结果表明，预放大器的更换并没有显著降低系统输出的ASE噪声，但是有利于减少系统输出的预脉冲。 4. 设计并建造了一套基于空间啁啾脉冲放大技术的新型宽带再生放大器，有效抑制了脉冲放大过程中的增益窄化效应，获得了几乎没有光谱损失的放大激光脉冲。 5. 设计并建造了一套激光光路辅助调节装置，降低了钕玻璃泵浦激光系统的维护难度，并提高了光路定位精度。 |
| 英文摘要 | The advent of CPA (Chirped Pulse Amplification) technique in 1985 and the birth of self-mode-lock Ti:sapphire laser in 1991 lay the foundation for the development of ultrashort ultraintense laser. Such kind of laser are valuable for a variety of high-field application, and the application makes a claim in turn for higher and higher technological idex of laser system. The seeking for more powerfull laser has never ceased. Although the OPCPA (Optical Parametric Chirped Pulse Amplification) technique has been proved to be more potential than CPA technique, based on its superiority in gain bandwidth, thermal effect and B integration, CPA technique is still the main method to achieve ultrashort, ultraintense laser pulses. Until now, the TW-level CPA system has been commercially available, the 100-TW-level CPA system has also been realized in several Labs and Companies, the age of petawatt laser is coming. The work of this thesis aims at the development and optimization of a femtosecond petawatt-level laser system. The main work includes: amplification of ultrashort laser pulses, dispersion compensation, newly designed pre-amplifier, development of a CCD-aided laser pointing system. The main results in the thesis can be summarized as follows: 1. Participating in the development of a 10-TW-level Ti:sapphire CPA system. The gain narrowing effect is alleviated effectively by introducing a birefringent plate in the regenerative amplifier; The pump fluence in the multipass amplifier is optimized, which helps to make the system more compactable and also save the cost. Laser pulses with pulse duration of 23fs and peak power of 17TW are obtained. 2. Participating in the upgrading of the 17TW, 23fs laser system to a petawatt-level laser system. The feasibility of high order dispersion compensation by use of mismatched stretcher-compressor system is reviewed and verified. Plan for the improvement of high order dispersion compensation is given. 3. A mutipass pre-amplifier is developed that replaces the regenerative amplifier in the femtosecond petawatt laser system. Testing results indicate that, replacement of the pre-amplifier doesn’t significantly reduce the ASE (Amplified Spontaneous Emission), but it is effective in the reduction of the pre-pulses. 4. A broadband regenerative amplifer based on spatial chirp amplification is developed. The gain narrowing effect is alleviated sucessfully, and broadband pulse amplification without spctrum loss is realized. 5. A CCD-aided laser pointing system is degined, which ease the maintance of the Nd: Glass pump system, and improve the accuracy. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15236]  |
| 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 | 李闯. 飞秒拍瓦级激光系统研制和性能优化的若干问题研究[D]. 中国科学院上海光学精密机械研究所. 2008. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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