中国物理B ›› 2016, Vol. 25 ›› Issue (4): 44204-044204.doi: 10.1088/1674-1056/25/4/044204

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

Laser frequency locking based on the normal and abnormal saturated absorption spectroscopy of 87Rb

Jian-Hong Wan(万剑宏), Chang Liu(刘畅), Yan-Hui Wang(王延辉)   

  1. School of Electronics and Engineering Computer Science, Peking University, Beijing 100871, China
  • 收稿日期:2015-08-12 修回日期:2015-11-26 出版日期:2016-04-05 发布日期:2016-04-05
  • 通讯作者: Yan-Hui Wang E-mail:wangyanhui@pku.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11174015).

Laser frequency locking based on the normal and abnormal saturated absorption spectroscopy of 87Rb

Jian-Hong Wan(万剑宏), Chang Liu(刘畅), Yan-Hui Wang(王延辉)   

  1. School of Electronics and Engineering Computer Science, Peking University, Beijing 100871, China
  • Received:2015-08-12 Revised:2015-11-26 Online:2016-04-05 Published:2016-04-05
  • Contact: Yan-Hui Wang E-mail:wangyanhui@pku.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11174015).

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摘要：

We present a practical method to avoid the mis-locking phenomenon in the saturated-absorption-spectrum laser-frequency-locking system and set up a simple theoretical model to explain the abnormal saturated absorption spectrum. The method uses the normal and abnormal saturated absorption spectra of the same transition 52S1/2, F=2-52P3/2, F'=3 saturated absorption of the 87Rb D2 resonance line. After subtracting these two signals with the help of electronics, we can obtain a spectrum with a single peak to lock the laser. In our experiment, we use the normal and inverse signals of the transitions 52S1/2, F=2-52P3/2, F'=3 saturated absorption of the 87Rb D2 resonance line to lock a 780-nm distributed feedback (DFB) diode laser. This method improves the long-term locking performance and is suitable for other kinds of diode lasers.

关键词: laser, Zeeman effect, semiconductor laser

Abstract:

We present a practical method to avoid the mis-locking phenomenon in the saturated-absorption-spectrum laser-frequency-locking system and set up a simple theoretical model to explain the abnormal saturated absorption spectrum. The method uses the normal and abnormal saturated absorption spectra of the same transition 52S1/2, F=2-52P3/2, F'=3 saturated absorption of the 87Rb D2 resonance line. After subtracting these two signals with the help of electronics, we can obtain a spectrum with a single peak to lock the laser. In our experiment, we use the normal and inverse signals of the transitions 52S1/2, F=2-52P3/2, F'=3 saturated absorption of the 87Rb D2 resonance line to lock a 780-nm distributed feedback (DFB) diode laser. This method improves the long-term locking performance and is suitable for other kinds of diode lasers.

Key words: laser, Zeeman effect, semiconductor laser

中图分类号:  (Lasers)

  • 42.55.-f
32.60.+i (Zeeman and Stark effects) 42.55.Px (Semiconductor lasers; laser diodes)