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Chin. Phys., 2000, Vol. 9(4): 259-273    DOI: 10.1088/1009-1963/9/4/004
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

QUANTUM LANGEVIN THEORY OF WHISPERING-GALLERY-MODE MICROSPHERE LASER

Lu Yi-quna, Leung Pui-tangb, Chai Jin-huac
a Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, Hefei 230031, China; b Department of Physics, Chinese University of Hong Kong; c Department of Physics, Chinese University of Hong Kong; Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, Hefei 230031, China
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.
Received:  03 June 1999      Published:  12 June 2005
PACS:  42.50.Ar  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
  42.55.Ah (General laser theory)  
Fund: Project supported by the Foundation of Chinese University of Hong Kong.

Cite this article: 

Chai Jin-hua, Lu Yi-qun, Leung Pui-tang QUANTUM LANGEVIN THEORY OF WHISPERING-GALLERY-MODE MICROSPHERE LASER 2000 Chin. Phys. 9 259

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