Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (6): 91 doi: 10.1007/s41365-018-0419-8

• SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS • Previous Articles    

2.856 GHz microwave signal extraction from mode-locked Er-fiber lasers with sub-100 femtosecond timing jitter

Wen-Yan Zhang,· Xiao-Qing Liu,· Lie Feng,· Tai-He Lan,· Xing-Tao Wang,· Bo Liu   

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 239 Zhangheng Road, Pudong District 201800, Shanghai, China
  • Contact: Xiao-Qing Liu E-mail:liuxiaoqing@sinap.ac.cn
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (No. 11175241).

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Wen-Yan Zhang, · Xiao-Qing Liu, · Lie Feng, · Tai-He Lan, · Xing-Tao Wang, · Bo Liu. 2.856 GHz microwave signal extraction from mode-locked Er-fiber lasers with sub-100 femtosecond timing jitter.Nuclear Science and Techniques, 2018, 29(6): 91     doi: 10.1007/s41365-018-0419-8

Abstract:

A balanced optical microwave phase detector (BOMPD) based on a 3 ×3 coupler is presented. This system was developed to extract ultra-low-jitter microwave signals from optical pulse trains emitted by mode-locked Er-fiber lasers, and synchronized microwave and laser systems. We demonstrate that the BOMPD achieves a precision of synchronization of less than 100 femtosecond of timing jitter. The experimental setup can be applied to the soft X-ray free-electron laser located on the campus of the Shanghai synchrotron radiation facility. A microwave signal with a 2.856 GHz frequency is extracted from a 238 MHz mode-locked Er-laser, with an absolute timing jitter of 34 fs in the 10 Hz–10 MHz frequency offset range. In addition, the microwave and 238 MHz optical pulse signals are synchronized with a relative timing jitter of 16 fs at the same frequency offset range.

Key words: BOMPD, 3 × 3 coupler, Timing jitter, Mode-locked Er-fiber laser, SXFEL