中国物理B ›› 2009, Vol. 18 ›› Issue (3): 1141-1146.doi: 10.1088/1674-1056/18/3/050

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Anisotropic optical feedback of single frequency intra-cavity He--Ne laser

张斌1, 周鲁飞2, 张书练2, 谈宜东2, 刘维新2   

  1. (1)Department of Optics Science and Technology, National University of Defense Technology, Hunan 410073, China; (2)The State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
  • 收稿日期:2008-06-27 修回日期:2008-08-16 出版日期:2009-03-20 发布日期:2009-03-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60437010).

Anisotropic optical feedback of single frequency intra-cavity He--Ne laser

Zhou Lu-Fei(周鲁飞)a), Zhang Bin(张斌)b), Zhang Shu-Lian(张书练)a), Tan Yi-Dong(谈宜东)a), and Liu Wei-Xin(刘维新)a)   

  1. a The State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China; b Department of Optics Science and Technology, National University of Defense Technology, Hunan 410073, China
  • Received:2008-06-27 Revised:2008-08-16 Online:2009-03-20 Published:2009-03-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60437010).

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摘要： This paper presents the anisotropic optical feedback of a single frequency intra-cavity He--Ne laser. A novel phenomenon was discovered that the laser output an elliptical polarized frequency instead of the initial linear polarized one. Two intensities with a phase difference were detected, both of which were modulated in the form of cosine wave and a fringe shift corresponds to a λ/2 movement of the feedback mirror. The phase difference can be continuously modulated by the wave plate in the external cavity. Frequency stabilization was used to stabilize the laser frequency so as to enlarge the measuring range and improve the measurement precision. This anisotropic optical feedback system offers a potential displacement measurement technology with the function of subdivision of λ/2 and in-time direction judgment. The three-mirror Fabry--Perot cavity model is used to present the experimental results. Given the lack of need of lasing adjustment, this full intra-cavity laser can significantly improve the simplicity and stability of the optical feedback system.

关键词: optical feedback, single frequency, mode competition, displacement measurement

Abstract: This paper presents the anisotropic optical feedback of a single frequency intra-cavity He--Ne laser. A novel phenomenon was discovered that the laser output an elliptical polarized frequency instead of the initial linear polarized one. Two intensities with a phase difference were detected, both of which were modulated in the form of cosine wave and a fringe shift corresponds to a $\lambda$/2 movement of the feedback mirror. The phase difference can be continuously modulated by the wave plate in the external cavity. Frequency stabilization was used to stabilize the laser frequency so as to enlarge the measuring range and improve the measurement precision. This anisotropic optical feedback system offers a potential displacement measurement technology with the function of subdivision of $\lambda$/2 and in-time direction judgment. The three-mirror Fabry--Perot cavity model is used to present the experimental results. Given the lack of need of lasing adjustment, this full intra-cavity laser can significantly improve the simplicity and stability of the optical feedback system.

Key words: optical feedback, single frequency, mode competition, displacement measurement

中图分类号:  (Gas lasers including excimer and metal-vapor lasers)

  • 42.55.Lt
42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)