高稳定钕玻璃再生放大技术研究
文献类型：学位论文
| 作者 | 王江峰 |
| 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 | 朱健强 |
| 关键词 | 再生放大 多程放大 激光二极管泵浦 种子激光脉冲 时域波形畸变 附加后缀脉冲 位相调制 幅度调制 光束质量 方波扭曲 |
| 其他题名 | Research on Highly Stable Nd:glass Regenerative Amplifier |
| 中文摘要 | 再生放大器是一种多程放大器，它能够实现小信号激光脉冲的若干数量级的高增益放大。再生放大器单程增益小，对泵浦功率的要求低，能量提取效率高；特别是对于小发射截面增益介质，例如钕玻璃介质，再生放大器可以高效的实现其对小信号激光脉冲的高增益放大。本论文的主要工作围绕应用于高功率激光装置的激光二极管泵浦钕玻璃再生放大器的设计和实验研究展开，论文的主要内容归纳如下： 1、介绍了再生放大器的基本结构和性能、发展和应用以及在ICF装置中的应用； 2、介绍了脉冲放大的理论和数值计算方法；并依此为基础，研究了再生放大器的放大过程，分析了再生放大器的放大特性、稳定性和输出激光脉冲的时域波形畸变；提出了一种降低时域波形畸变的方法：附加后缀脉冲方法，并在理论上证明了该方法的可行性； 3、以谐振腔设计理论为基础，分析了腔镜失调对线性腔和环形腔的影响，并简要介绍了线性腔和环形腔的优缺点； 4、利用现有的二极管泵浦Nd:YLF激光放大模块完成了一台Nd:YLF再生放大器样机，对再生放大器的设计和放大特性等进行了初步的实验研究；Nd:YLF再生放大器输出激光脉冲能量4.2mJ，总增益大于107，稳定度小于1％（rms），方波扭曲1.33； 5、利用Nd:YLF再生放大器在实验上验证了附加后缀脉冲方法在降低时域波形畸变方面的有效性；使用附加后缀脉冲方法，Nd:YLF再生放大器的方波扭曲由1.33降至1.17； 6、在Nd:YLF再生放大器基础上，设计并实现了钕玻璃再生放大器样机。从避免电光开关KD*P晶体光学破坏的角度出发，重新设计了再生放大器谐振腔结构，并对钕玻璃介质的热透镜效应进行了分析。钕玻璃再生放大器输出激光脉冲能量13 mJ，总增益大于107，稳定度小于1％ (rms)，方波扭曲1.47； 7、从理论上研究了腔镜失调对再生放大器输出特性的影响，并根据再生放大器稳定性要求，计算出了钕玻璃再生放大器腔镜角度失调的容限； 8、研究了宽谱光的传输特性，分析了宽谱光放大过程中由于增益窄化引起的幅度调制。理论分析和实验结果表明，位相调制带宽为30G时，钕玻璃再生放大器在放大宽谱光的过程中引入的幅度调制可以忽略； 9、研究了谐振腔内选模光阑的衍射对钕玻璃再生放大器的输出光束质量的影响。 |
| 英文摘要 | Regenerative amplifier, which is a multi-pass amplifier, can achieve an orders-of-magnitudes gain with a low energy injected seed pulse. The main features of the regenerative amplifier are very huge gain, and high energy extract efficiency. With low single-pass gain, the regenerative amplifier has a low requirement for pumping power, and even using a gain medium with low emission cross section, such as Nd:glass, high efficiency amplification could be achieved. This dissertation mainly focuses on the design and experimental study of a laser diode-pumped Nd:glass regenerative amplifier, the main research work can be summarized as follows: 1. A complete introduction of regenerative amplifier is presented, including the basic configuration, performance, development and application in the laser system of ICF. 2. Base on the theory of pulse amplification and numerical method, the process of regenerative amplification is studied. Meanwhile, amplification characteristics, stability and temporal pulse profile distortion of the regenerative amplifier are fully analysed. A new method for decreasing the temporal pulse profile distortion by using extra post-pulse is proposed. The feasibility of this method is testified by theoretical analysis. 3. Merits and faults of linear cavity and ring cavity are briefly introduced. Base on the design theory of resonant cavity, the influence of cavity mirrors misalignment on linear cavity and ring is also analyzed. 4. A laser diode–pumped Nd:YLF regenerative amplifier is developed. A preliminary experimental study on design and amplification characteristics of the regenerative amplifier is carried out. The Nd:YLF regenerative amplifier shows output energy of 4.2 mJ, with a total energy gain more than 107, output energy stability better than 1% rms and square-pulse distortion about 1.33. 5. The validity of the extra post-pulse on decreasing the temporal pulse profile distortion is also testified in experiments. When an extra post-pulse is added, square-pulse distortion is decreased from 1.33 to 1.17. 6. Base on the Nd:YLF regenerative amplifier, we developed a Nd:glass regenerative amplifier. In order to protect KD*P crystal using in the Pockels cell from optical damage, we redesigned the resonant cavity configuration. The influence of thermal lens effect is also studied. The Nd:glass regenerative amplifier shows output energy of 13 mJ, with a total energy gain more than 107, output energy stability better than 1% rms and square-pulse distortion of 1.47. 7. The influence of cavity mirrors misalignment on output characteristics of the regenerative amplifier is studied theoretically. According to the requirements of regenerative amplifier stability, misalignment tolerance of the cavity mirror is calculated. 8. The propagation characteristics of broadband optical pulse are studied. The amplitude modulation induced by gain narrowing in the process of broadband optical pulse amplification is also analyzed. Theoretical analysis and experimental results show that the amplitude modulation in Nd:glass regenerative amplifier could be neglected when the bandwidth of phase modulation is about 30G. 9. The influence of diffraction induced by mode-selection aperture on output laser beam quality of the regenerative amplifier is studied. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15604]  |
| 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 | 王江峰. 高稳定钕玻璃再生放大技术研究[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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