多束拍瓦相位同步诊断方法研究
文献类型：学位论文
| 作者 | 王杨 |
| 学位类别 | 硕士 |
| 答辩日期 | 2015 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 朱宝强 |
| 关键词 | 高功率激光 超短脉冲 相干合成 相位测量 |
| 其他题名 | The Diagnosis Method Research on Phase Synchronization of Muilt-Petawatt Lasers |
| 中文摘要 | 随着现代高功率超短脉冲激光技术的发展，为获得更高的聚焦功率密度，提高激光器的输出能力，科学家们提出了多束脉冲相干合成技术。为使该方法能切实，稳定，高速的实施，要求有切实可靠的方法来保证光束间时间同步与相位同步。 本文致力于研究以高功率激光驱动器为基础的，皮秒级多束拍瓦激光相位同步诊断技术。目的是为了在激光驱动器进行多光束相干合成实验时能对参与合成的光束之间的时间同步与相位同步情况进行检测与诊断。本文主要的研究内容如下： 1、 从理论上讨论了多束拍瓦激光进行相干合成时的时间同步与相位同步特性。以皮秒级短脉冲为基础，理论分析与模拟了脉冲时间特性对双光束合成时的影响。并在夫琅禾费衍射理论基础上，模拟与分析了多束平面波进行相干合成时，近场分布、束间相位差、光束指向性、波前畸变与系统像差等因素对焦斑形态及能量分布的影响。 2、 完成了利用皮秒脉冲进行的单次皮秒自相关仪时间分辨率标定实验。通过附加鉴别率板在单次自相关过程的一个光学臂上，由此实现光束横截面上的空间调制。带有空间调制的光束经过自相关晶体之后，在自相关信号中也产生了对应的空间调制,由此获得时间分辨率。通过此种方法获得的结果与利用传统方法获得结果只相差3.3%。 3、 提出利用时分复用法来实现离线平台上多束皮秒（~10ps）级脉冲的相干合成，并通过分析焦斑的光强分布，来诊断双光束间相位差。以两束皮秒量级的超短脉冲为例。首先，基于自相关的方法实现两束超短脉冲间的时间同步，然后在时间同步范围内，调节光束间的位相差，并同步监测远场上焦斑干涉图样变化，来实现两束超短脉冲之间的相位同步。初步实验验证表明，该诊断技术方案能够实现两束超短脉冲间的束间同步状态的诊断。 |
| 英文摘要 | With the development of high-power lasers, and in order to acquire higher focal power density and improve the laser output capability, the scientists raised coherent combination concept. To assure the feasible, stable and high-speed implement of this concept, keeping temporal and phase synchronization within the beams is necessary. This paper devotes to the study of the diagnostics for phase synchronization within multi-petawatt picosecond pulses based on high-energy laser facilities and aimed to detect and diagnose the temporal and phase synchronization in multi-beam coherent combination experiment. The contributions of this thesis are: 1、 This paper explores the temporal and phase synchronization characteristics of multi-petawatt pulses coherent combination in theory. Taking two picosecond pulses for example, analyzed and simulated the influence of temporal characteristics on dual beam combination. And based on the Fraunhofer diffraction theory, beam layout, phase difference between beams, beam directivity, wave front aberration, system aberration and so on are analyzed on qualitatively and quantitatively. 2、 A new method is proposed and tested to testify the temporal resolution of a single-shot autocorrelator. A Resolution-Test-Pattern is installed on one arm of the autocorrelator to add streaks on the beam cross-section. In addition, an autocorrelation signal is modulated when the streaked beam arrives at the autocorrelation crystal. Comparing the temporal resolution by this scheme with the results of traditional femtosecond scan method, the relative error is 3.3%. 3、 Utilize the time division multiplexing method to realize two picosecond pulses (~10ps) coherent combination experiment. And analyze the intensity distribution on focal spot to diagnose the phase difference. Taking two beams for example, based on the cross-correlation method to realize the time synchronization between these two pulses at first. Then, adjust the phase difference within the range of time synchronization. By monitoring the focal spot on far-field can implement the phase synchronization of two pulses. The experiment results showed that this scheme can realize the diagnostics for synchronization between two ultrashort pulses both in temporal and in spatial. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16895]  |
| 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 | 王杨. 多束拍瓦相位同步诊断方法研究[D]. 中国科学院上海光学精密机械研究所. 2015. |
入库方式： OAI收割
来源：上海光学精密机械研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。