中国物理B ›› 2000, Vol. 9 ›› Issue (4): 259-273.doi: 10.1088/1009-1963/9/4/004

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QUANTUM LANGEVIN THEORY OF WHISPERING-GALLERY-MODE MICROSPHERE LASER

路轶群1, 梁培2, 柴金华3   

  1. (1)Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, Hefei 230031, China; (2)Department of Physics, Chinese University of Hong Kong; (3)Department of Physics, Chinese University of Hong Kong; Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, Hefei 230031, China
  • 收稿日期:1999-06-03 出版日期:2000-04-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the Foundation of Chinese University of Hong Kong.

QUANTUM LANGEVIN THEORY OF WHISPERING-GALLERY-MODE MICROSPHERE LASER

Chai Jin-hua (柴金华)ab, Lu Yi-qun (路轶群)b, Leung Pui-tang (梁培)a   

  1. a Department of Physics, Chinese University of Hong Kong;  b Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, Hefei 230031, China
  • Received:1999-06-03 Online:2000-04-15 Published:2005-06-12
  • Supported by:
    Project supported by the Foundation of Chinese University of Hong Kong.

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摘要： A quantum Langevin theory of whispering-gallery-mode microsphere laser theory is developed. The linear and nonlinear analysis are made for laser operation below and above the threshold. In these analysis, corresponding to the specific property of microsphere, the effect of inversion fluctuation is treated. The coherence functions of laser field are calculated, and the intensity, the amplitude fluctuation and the linewidth of the field are obtained, which are connected with the enhancement factor of whispering-gallery-mode microsphere. It is shown that the strong couple and strong pumping are useful for the amplification of intensity and the decrease of linewidth below the threshold. It is also shown that, for the laser action above threshold, the variances of photon number and the linewidth of internal field are related to the enhancement factor and the square of the enhancement factor, respectively.

Abstract: A quantum Langevin theory of whispering-gallery-mode microsphere laser theory is developed. The linear and nonlinear analysis are made for laser operation below and above the threshold. In these analysis, corresponding to the specific property of microsphere, the effect of inversion fluctuation is treated. The coherence functions of laser field are calculated, and the intensity, the amplitude fluctuation and the linewidth of the field are obtained, which are connected with the enhancement factor of whispering-gallery-mode microsphere. It is shown that the strong couple and strong pumping are useful for the amplification of intensity and the decrease of linewidth below the threshold. It is also shown that, for the laser action above threshold, the variances of photon number and the linewidth of internal field are related to the enhancement factor and the square of the enhancement factor, respectively.

中图分类号: 

  • 42.50.Ar
42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps) 42.55.Ah (General laser theory)