中国物理B ›› 2006, Vol. 15 ›› Issue (2): 340-346.doi: 10.1088/1009-1963/15/2/019

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Strong optical feedback in birefringent dual frequency laser

毛威, 张书练   

  1. The State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments, Tsinghua University, Beijing 100084, China
  • 收稿日期:2005-05-31 修回日期:2005-09-29 出版日期:2006-02-20 发布日期:2006-02-20
  • 基金资助:
    Project supported by the Major Program of National Natural Science Foundation of China (Grant No 60438010).

Strong optical feedback in birefringent dual frequency laser

Mao Wei (毛威), Zhang Shu-Lian (张书练)   

  1. The State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments, Tsinghua University, Beijing 100084, China
  • Received:2005-05-31 Revised:2005-09-29 Online:2006-02-20 Published:2006-02-20
  • Supported by:
    Project supported by the Major Program of National Natural Science Foundation of China (Grant No 60438010).

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摘要： Strong optical feedback in a birefringent dual frequency He--Ne laser with a high reflectivity feedback mirror has been investigated for the first time. The output characteristics of two orthogonally polarized modes are demonstrated in two different optical feedback cases: one is for both modes being fed back and the other is for only one of the modes being fed back. Strong mode competition can be observed between the two modes with strong optical feedback. And when one mode's intensity is near its maximum, the other mode is nearly extinguished. When both modes are fed back into the laser cavity, the mode competition is stronger than when only one mode is fed back. The difference in initial intensity between the two orthogonally polarized modes plays an important role in the mode competition, which has been experimentally and theoretically demonstrated.

Abstract: Strong optical feedback in a birefringent dual frequency He--Ne laser with a high reflectivity feedback mirror has been investigated for the first time. The output characteristics of two orthogonally polarized modes are demonstrated in two different optical feedback cases: one is for both modes being fed back and the other is for only one of the modes being fed back. Strong mode competition can be observed between the two modes with strong optical feedback. And when one mode's intensity is near its maximum, the other mode is nearly extinguished. When both modes are fed back into the laser cavity, the mode competition is stronger than when only one mode is fed back. The difference in initial intensity between the two orthogonally polarized modes plays an important role in the mode competition, which has been experimentally and theoretically demonstrated.

Key words: strong optical feedback, intensity modulation, dual frequency laser, mode competition

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

  • 42.55.Lt
42.60.By (Design of specific laser systems) 42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 42.60.Fc (Modulation, tuning, and mode locking)