中国物理B ›› 2007, Vol. 16 ›› Issue (4): 1020-1026.doi: 10.1088/1009-1963/16/4/026

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Intensity modulation in single-mode microchip Nd:YAG lasers with asymmetric external cavity

谈宜东, 张书练, 刘维新, 毛威   

  1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
  • 收稿日期:2006-06-29 修回日期:2006-11-06 出版日期:2007-04-20 发布日期:2007-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No~60438010).

Intensity modulation in single-mode microchip Nd:YAG lasers with asymmetric external cavity

Tan Yi-Dong(谈宜东)†, Zhang Shu-Lian(张书练), Liu Wei-Xin(刘维新), and MaoWei(毛威)   

  1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
  • Received:2006-06-29 Revised:2006-11-06 Online:2007-04-20 Published:2007-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No~60438010).

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摘要： Intensity modulation induced by the asymmetric external cavity in single-mode microchip Nd:YAG lasers is presented. Two kinds of experimental results are discussed based on multiple feedback effects. In one case, the intensity modulation curve is a normal sine wave, whose fringe frequency is four times higher than that of a conventional optical feedback system, caused by multiple feedback effects. In the other case, the intensity modulation curve is the overlapping of the above quadruple-frequency signal and conventional optical feedback signal, which is determined by the additional phase difference induced by the asymmetric external cavity. The theoretical analyses are in good agreement with the experimental results. The quadruple-frequency modulation of the laser output intensity can greatly increase the resolution of displacement measurement of an optical feedback system.

Abstract: Intensity modulation induced by the asymmetric external cavity in single-mode microchip Nd:YAG lasers is presented. Two kinds of experimental results are discussed based on multiple feedback effects. In one case, the intensity modulation curve is a normal sine wave, whose fringe frequency is four times higher than that of a conventional optical feedback system, caused by multiple feedback effects. In the other case, the intensity modulation curve is the overlapping of the above quadruple-frequency signal and conventional optical feedback signal, which is determined by the additional phase difference induced by the asymmetric external cavity. The theoretical analyses are in good agreement with the experimental results. The quadruple-frequency modulation of the laser output intensity can greatly increase the resolution of displacement measurement of an optical feedback system.

Key words: optical feedback, asymmetric external cavity, multiple feedbacks

中图分类号:  (Doped-insulator lasers and other solid state lasers)

  • 42.55.Rz
42.60.By (Design of specific laser systems) 42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 42.60.Fc (Modulation, tuning, and mode locking) 42.79.Bh (Lenses, prisms and mirrors)