Precise laser-beam synchronization for Shanghai Deep-Ultraviolet Free-Electron Laser
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摘要: 介绍了一种基于相干辐射测量的激光-电子束同步方法，描述了实现空间及时间同步的基本原理、步骤和细节，并利用这种方法在上海深紫外自由电子激光装置（SDUV-FEL）上实现了电子束与激光之间亚ps量级的精确同步，为基于外种子激光的高增益高次谐波产生（HGHG）、回声型谐波产生（EEHG）和级联HGHG自由电子激光实验奠定了坚实的基础。还利用这种手段对不同条件下的电子束纵向特性进行了测量和分析。Abstract: A general laser-beam synchronization method based on coherent radiation measurement is introduced. Fundamental principles and detailed steps to achieve spatial and temporal synchronization are described. Sub-picosecond level synchronization between the seed laser and the electron beam has been achieved with this method at the Shanghai Deep-Ultraviolet Free-Electron Laser (SDUV-FEL) test facility, which lays a solid foundation for seeding experiments such as high-gain harmonic-generation (HGHG), echo-enabled harmonic-generation (EEHG) and cascaded HGHG. Moreover, longitudinal profiles of the electron beam under different conditions are measured and analyzed.
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Key words:
- free-electron laser /
- electron beam /
- synchronization /
- coherent radiation measurement
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