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北京大学DC-SRF-II注入器光阴极驱动激光系统

冯立文 王天一 贾豪彦 刘中琦 徐航 黄森林 刘克新

冯立文, 王天一, 贾豪彦, 等. 北京大学DC-SRF-II注入器光阴极驱动激光系统[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.210343
引用本文: 冯立文, 王天一, 贾豪彦, 等. 北京大学DC-SRF-II注入器光阴极驱动激光系统[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.210343
Feng Liwen, Wang Tianyi, Jia Haoyan, et al. Peking University’s DC-SRF-II photoinjector drive laser system[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.210343
Citation: Feng Liwen, Wang Tianyi, Jia Haoyan, et al. Peking University’s DC-SRF-II photoinjector drive laser system[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.210343

北京大学DC-SRF-II注入器光阴极驱动激光系统

doi: 10.11884/HPLPB202234.210343
基金项目: 国家重点研发计划项目(2017YFA0701000)
详细信息
    作者简介:

    冯立文,lwfeng@pku.edu.cn

  • 中图分类号: TN248.1

Peking University’s DC-SRF-II photoinjector drive laser system

  • 摘要: 为满足北京大学新一代超导注入器DC-SRF-II注入器的需求,设计了新的光阴极驱动激光系统。系统采用模块化的布局,可以工作在从单脉冲到81.25 MHz连续波模式,绿光输出功率1.41 W @ 1 MHz。系统实现了激光的纵向和横向整形,纵向整形后的激光脉冲为平顶分布,脉宽约为18 ps,横向则为截断高斯分布。实验结果显示,输出激光的RMS功率波动为1.8%,指向抖动小于1 μrad。
  • 图  1  北京大学DC-SRF注入器双碱光阴极驱动激光系统

    Figure  1.  Peking University’s DC-SRF injector photocathode drive laser system

    ① seed source, ② amplification system, ③ frequency doubling system, ④ longitudinal shaping system, ⑤ cross-correlation measurement system, ⑥ transverse shaping system, ⑦ laser transmission system

    图  2  DC-SRF驱动激光系统倍频与纵向整形系统光路示意图

    Figure  2.  Schematic diagram of frequency doubling and longitudinal shaping system

    图  3  互相关光路示意图

    Figure  3.  Schematic diagram of cross-correlation measurement

    图  4  利用互相关测量系统测得的激光脉冲形状

    Figure  4.  Laser pulse shape measured by cross-correlation measurement system

    图  5  DC-SRF-II 注入器驱动激光横向整形与传输系统

    Figure  5.  DC-SRF-II laser transverse shaping and transmission system

    图  6  (a)横向整形前光斑分布; (b)经过横向整形和传输后虚阴极处光斑分布

    Figure  6.  (a) Laser distribution before transverse shaping; (b) Laser distribution at the virtual cathode after transverse shaping and transmission

    图  7  虚阴极处光斑中心位置抖动

    Figure  7.  The spot center position jitter at the virtual cathode

    图  8  7小时激光功率稳定性测量

    Figure  8.  Seven hour laser power stability measurement

    表  1  放大器的输出参数表

    Table  1.   DC-SRF-II laser amplifier parameters

    output power21 W @ 10 MHz
    20.5 W @ 81.25 MHz
    2.2 W @ 1 MHz
    spectral width< 3 nm, @ 1037 nm
    pulse energy2 µJ @ 10 MHz
    pulse width1.5 ps @ 10 MHz & 1 MHz
    4 ps @ 81.25 MHz
    M2<1.3
    下载: 导出CSV
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    Li Weihua, Tang Jun, Chen Ya’nan, et al. Research of the drive laser for FEL[J]. Laser Technology, 2009, 33(6): 619-621,625
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    Li Xiaoshen, Xu Jinqiang, Sun Darui. Drive laser system for a photocathode at IHEP[J]. High Power Laser and Particle Beams, 2018, 30: 021001 doi: 10.11884/HPLPB201830.170344
    [12] Wang Zhiwen, Huang Senlin, Lin Lin, et al. Drive laser system for the DC-SRF photoinjector at Peking University[J]. Chinese Physics C, 2016, 40: 017004. doi: 10.1088/1674-1137/40/1/017004
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出版历程
  • 收稿日期:  2021-08-06
  • 录用日期:  2022-04-28
  • 修回日期:  2022-04-18
  • 网络出版日期:  2022-05-06

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