中国物理B ›› 2019, Vol. 28 ›› Issue (7): 74209-074209.doi: 10.1088/1674-1056/28/7/074209

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock

Xi Zhang(张茜), Fei Yang(杨飞), Zi-Tong Feng(冯子桐), Jie-Jun Zhao(赵洁珺), Fang Wei(魏芳), Hai-Wen Cai(蔡海文), Rong-Hui Qu(瞿荣辉)   

  1. 1 Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
    2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2019-04-08 修回日期:2019-05-09 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: Fei Yang, Hai-Wen Cai E-mail:fyang@siom.ac.cn;hwcai@siom.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 61875214, 61535014, and 61775225) and Scientific Innovation Fund of Chinese Academy of Sciences (Grant No. CXJJ-17S010).

Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock

Xi Zhang(张茜)1,2, Fei Yang(杨飞)1, Zi-Tong Feng(冯子桐)1,2, Jie-Jun Zhao(赵洁珺)1,2, Fang Wei(魏芳)1, Hai-Wen Cai(蔡海文)1,2, Rong-Hui Qu(瞿荣辉)1   

  1. 1 Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
    2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-04-08 Revised:2019-05-09 Online:2019-07-05 Published:2019-07-05
  • Contact: Fei Yang, Hai-Wen Cai E-mail:fyang@siom.ac.cn;hwcai@siom.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 61875214, 61535014, and 61775225) and Scientific Innovation Fund of Chinese Academy of Sciences (Grant No. CXJJ-17S010).

摘要:

We propose a method to directly measure phase-related noise characteristics of single-frequency lasers in the 728-980 nm band based on a 120° phase difference interferometer. Differential phase information of the laser under test is demodulated via the interferometer. Other parameters related to the phase noise characteristics such as linewidth at different observation time, phase/frequency noise, power spectrum density of phase/frequency fluctuation, and Allan deviation are further obtained. Frequency noise as low as 1 Hz2/Hz can be measured using our system. Then the phase-related noise characteristics of two commercial lasers frequently used in cold atomic clocks are studied systematically by the method. Furthermore, several influencing factors and their relative evolution laws are also revealed, such as the pump current and frequency-locking control parameters. This would help to optimize the laser performance, select laser sources, and evaluate the system performance for cold atomic physics applications.

关键词: cold atomic physics, quantum mechanics, 780 nm lasers, phase/frequency noise

Abstract:

We propose a method to directly measure phase-related noise characteristics of single-frequency lasers in the 728-980 nm band based on a 120° phase difference interferometer. Differential phase information of the laser under test is demodulated via the interferometer. Other parameters related to the phase noise characteristics such as linewidth at different observation time, phase/frequency noise, power spectrum density of phase/frequency fluctuation, and Allan deviation are further obtained. Frequency noise as low as 1 Hz2/Hz can be measured using our system. Then the phase-related noise characteristics of two commercial lasers frequently used in cold atomic clocks are studied systematically by the method. Furthermore, several influencing factors and their relative evolution laws are also revealed, such as the pump current and frequency-locking control parameters. This would help to optimize the laser performance, select laser sources, and evaluate the system performance for cold atomic physics applications.

Key words: cold atomic physics, quantum mechanics, 780 nm lasers, phase/frequency noise

中图分类号:  (Lasers)

  • 42.55.-f
42.60.Mi (Dynamical laser instabilities; noisy laser behavior) 31.30.J- (Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions) 03.75.Be (Atom and neutron optics)