基于近场外差散斑的自由电子激光横向相干性测量研究

姚超; 陈建辉; 王东; 李春雷

doi:10.11889/j.0253-3219.2018.hjs.41.100101

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基于近场外差散斑的自由电子激光横向相干性测量研究

同步辐射技术及应用 | 更新时间：2021-05-19

- 基于近场外差散斑的自由电子激光横向相干性测量研究
- Research on probing the transverse coherence of the self-amplified spontaneous emission of a free-electron laser using near-field heterodyne speckle
- 核技术 2018年41卷第10期文章编号：100101
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
  
  [ "姚超, 男, 1992年出生, 2015年毕业于兰州大学, 现为硕士研究生, 研究领域为自由电子激光相干性测量", "YAO Chao, male, born in 1992, graduated from LanZhou University in 2015, master student, focusing on coherence measurement of free electron laser" ]
  陈建辉, E-mail:chenjianhui@sinap.ac.cn CHEN Jianhui, E-mail:chenjianhui@sinap.ac.cn
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.100101
  中图分类号： TN248.6
- 收稿日期：2018-03-19，
  
  修回日期：2018-05-04，
  
  纸质出版日期：2018-10-10
- 稿件说明：
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姚超, 陈建辉, 王东, 等. 基于近场外差散斑的自由电子激光横向相干性测量研究[J]. 核技术, 2018,41(10):100101

Chao YAO, Jianhui CHEN, Dong WANG, et al. Research on probing the transverse coherence of the self-amplified spontaneous emission of a free-electron laser using near-field heterodyne speckle[J]. Nuclear techniques, 2018, 41(10): 100101
姚超, 陈建辉, 王东, 等. 基于近场外差散斑的自由电子激光横向相干性测量研究[J]. 核技术, 2018,41(10):100101 DOI： 10.11889/j.0253-3219.2018.hjs.41.100101.

Chao YAO, Jianhui CHEN, Dong WANG, et al. Research on probing the transverse coherence of the self-amplified spontaneous emission of a free-electron laser using near-field heterodyne speckle[J]. Nuclear techniques, 2018, 41(10): 100101 DOI： 10.11889/j.0253-3219.2018.hjs.41.100101.

摘要

相干性是X射线自由电子激光（X-ray Free-Electron Laser，XFEL）最重要和显著的特点之一，在自放大自发辐射（Self-Amplified Spontaneous Emission，SASE）模式下，XFEL光输出功率极不稳定且强度分布差异较大。为能够用简单系统同时测量二维平面的横向相干性，本文提出一种基于近场外差散斑的光脉冲相干性测量方案，该方案的优点是能实现单发脉冲和平均脉冲的横向相干性测量。将光脉冲照射在做布朗运动的纳米粒子溶液上产生近场外差散斑，通过散斑信号的功率谱分析得到光脉冲的横向相干性。文章重点在理论上研究了测量方案的可行性，结合上海软X射线自由电子激光SASE模式的光场仿真，通过数值模拟的方法获得了单粒子和多粒子外差散斑信号的空间分布，以及对应的横向相干性。未来此方法可以为自由电子激光的运行和用户提供在线的相干性信息。

Abstract

Background

Coherence is the most striking and fundamental property of the light waves produced by X-ray free-electron lasers (XFEL). The implementation of many experimental techniques exploiting coherent radiation from XFEL requires accurate characterization of spatial properties of the radiation at the sample positon.

Purpose

This paper aims to investigate the two-dimensional transverse coherence of the self-amplified spontaneous emission (SASE) of a free-electron laser radiation based on near-field heterodyne speckle.

Methods

The laser pulse is irradiated on the nanoparticle solution making Brownian movement to produce near-field heterodyne speckle. Use a splitter to split each single pulse into two equal-amplitude pulses and two statistically independent raw images are obtained simultaneously for accurate extraction of the heterodyne speckle intensity distribution. The square root of the two-dimensional power spatial frequency spectrum of the heterodyne speckle yields the modulus of the complex coherence factor.

Results

Theoretical and simulation results proved that the accurate extraction of heterodyne signal and availability of a full two-dimensional coherence map are possible.

Conclusion

The above-mentioned method has the capability to probe the real-time coherence property of XFEL photon pulses produced from SASE mode.

关键词

Keywords

references

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