超短超强激光创新发展中的若干重要问题研究
文献类型：学位论文
| 作者 | 冷雨欣 |
| 学位类别 | 博士 |
| 答辩日期 | 2002 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 徐至展 |
| 关键词 | 超短超强激光 光学参量 啁啾脉冲放大 再生放大器 Cr<'4+>:YAG晶体 |
| 其他题名 | Some important researches on novel development of ultra-short and ultra-intense laser |
| 中文摘要 | 超短超强激光的发展是光学学科中的一个重要领域.同时,超短超强激光自身持续不断的发展也需要深入研究其中的关键科学技术问题,该论文主要针对在超短超强激光发展中的创新概念-光学参量啁啾脉冲放大(OPCPA)新原理中的若干重要科学技术问题进行了理论模拟和实验验证.在理论模拟及相关技术研究的基础上,又进一步开展了台式OPCPA超短超强激光系统的集成开拓研究,发展了一系列创新技术,取得重大进展,得到了目前国际上OPCPA研究中输出总体水平最高的实验结果.另外,在现有的钛宝石CPA激光系统上也进行了若干与OPCPA技术相关的创新研究,研究的结果亦可以直接用于CPA激光系统的性能优化之中. |
| 英文摘要 | The development of ultra-short and ultra-intense laser is always an important field in optics. And the deep research on the key problem in this field is needed to keep the continuous development of ultra-short and ultra-intense laser itself. This dissertation gives some important research results on the novel conception in ultra-short and ultra-intense laser field, optical parametric chirped pulse amplification (OPCPA), by the theoretical simulation and the experimental demonstration. Based on the theory and the relative technical studies, the integrating research on a tabletop OPCPA ultra-short and ultra-intense laser system is carried out. A series of novel techniques are developed, and the highest output among OPCPA research is achieved in the world. Some novel research relating to OPCPA conception are carried out on the existent Ti: sapphire CPA laser system, the researching results can also be used directly to optimize the CPA laser system. The main results achieved in my dissertation as following: By means of the three-wave coupling equations, the theoretical model of OPCPA conception is set up. Using the OPCPA equations, the parameters of OPCPA, such as gain bandwidth, are simulated. Based on the theoretical simulation of the small signal amplification and the saturable amplification of OPCPA, a series of theoretical schemes of OPCPA laser system, whose output powers are from 10TW to 1000TW, are designed. The conception of the non-collinear broad band OPCPA of type-I phase matched BBO crystal is validated by both experiment and the theoretical analysis. The condition of obtaining optimum gain is achieved. The accuracy of the theoretical simulation is confirmed experimentally, which establishes the basement of OPCPA laser system. The optimization of the pumping laser system consisting of Nd:YAG pre-amplifiers and Nd:glass main amplifiers chain is carried out. The research results on the heat effect of Nd:galss main amplifiers chain can be used to promote the working efficiency of the whole OPCPA laser system. The key problem, namely the synchronization between the pumping and signal pulses in OPCPA laser systems is solved, which effects the stability of pulse amplification and the gain spectrum. By using the regenerative amplifier, the more accurate synchronization between the signal and pumping pulses in OPCPA laser system is achieved. The time jitter between the signal and pumping pulses is <10ps, which is the best synchronization accuracy in OPCPA laser system up to now. Furthermore, by means of the continual and real-time adjustment of pulse width output from the regenerative amplifier, the OPA process is optimized efficiently. The experimental validation and the integration research on high gain broadband OPCPA are finished. The 570mJ/155fs pulse output is achieved, and the peak power is promoted to 3.6TW. The peak power is the highest among the existent OPCPA laser system researches. Some related researches on the development of ultra-short and ultra-intense laser are as following: On a Tr.sapphire CPA laser system, the intra-cavity and the external-cavity spectral shaping techniques are researched theoretically and experimentally. The gain narrowing effect of the laser system is compensated efficiently. Using quartz birefringent crystal plate in intra-cavity spectral shaping experiment, the bandwidth of the regenerative amplifier is stretched. When the pulse with spectral shaping passes the compressor, the shorter compressed pulse width is achieved. On the Ti:sapphire CPA laser system, the stimulated Raman scattering (SRS) with broadband pulse pumping is researched. The conception of achieving ultra-short pulse with different frequency using SRS frequency shifting is presented. It is indicated that the conception is feasible in the elementary experimental research. The theoretical and experimental research on the excited state absorption, Q-switch and mode-locking effect of Cr4+:YAG crystal. Due to the excited state absorption of Cr4+:YAG crystal in Nd:YAG laser, the mode-locking pulse can be obtained. By using the Cr4+:YAG crystals with different initial transmission, the stable mode-locking pulses with different pulse width are achieved. We find first there is an optimum initial transmission, with which the mode-locking pulse width is the shortest (0.8ns). |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15563]  |
| 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 | 冷雨欣. 超短超强激光创新发展中的若干重要问题研究[D]. 中国科学院上海光学精密机械研究所. 2002. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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