中国物理B ›› 2008, Vol. 17 ›› Issue (10): 3765-3770.doi: 10.1088/1674-1056/17/10/039

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Spectrum evolutions of spontaneous and pump-depleted stimulated Brillouin scatterings in liquid media

吕志伟1, 何伟明1, 哈斯乌力吉1, 张 赞1, 高 玮2   

  1. (1)Institute of Opto-Electronics, Harbin Institute of Technology, Harbin 150001, China; (2)Institute of Opto-Electronics, Harbin Institute of Technology, Harbin 150001, China;Department of Applied Physics, Harbin University of Science and Technology, Harbin 150080, China
  • 收稿日期:2008-03-22 修回日期:2008-04-20 出版日期:2008-10-20 发布日期:2008-10-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60778019), the Program of Excellent Team in Harbin Institute of Technology, China, and the Program of Science and Technology of Education the Bureau of Heilongjiang Province, China (Grant No 11521048).

Spectrum evolutions of spontaneous and pump-depleted stimulated Brillouin scatterings in liquid media

Gao Wei(高玮)a)b), Lü Zhi-Wei(吕志伟)a)†, He Wei-Ming(何伟明)a), Hasi Wu-Li-Ji(哈斯乌力吉)a), and Zhang Zan(张赞)a)   

  1. a Institute of Opto-Electronics, Harbin Institute of Technology, Harbin 150001, China; b Department of Applied Physics, Harbin University of Science and Technology, Harbin 150080, China
  • Received:2008-03-22 Revised:2008-04-20 Online:2008-10-20 Published:2008-10-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60778019), the Program of Excellent Team in Harbin Institute of Technology, China, and the Program of Science and Technology of Education the Bureau of Heilongjiang Province, China (Grant No 11521048).

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摘要： A theoretical model for calculating spontaneous and stimulated Brillouin scattering(SBS) spectra is described. An empirical formula for the Stokes output spectral linewidth, a function of spontaneous Brillouin linewidth and the exponential gain coefficient, is obtained by the calculated data fitting. The formula holds true for two cases involving pump undepletion and depletion. The lineshape change from spontaneous to highly pump-depleted SBS spectra is also investigated. The result shows that for the pump power below the SBS threshold, the Stokes output spectral lineshape evolves from Lorentzian to approximately Gaussian as the pump power increases. For the pump power near or beyond the threshold, the SBS spectrum is in the form of a steady Gaussian profile, and the spectral linewidth comes to a certain value about 7 times narrower than the spontaneous one. The theoretical results are experimentally demonstrated by using several common liquid media.

关键词: Brillouin scattering, spectrum evolution, linewidth, lineshape

Abstract: A theoretical model for calculating spontaneous and stimulated Brillouin scattering(SBS) spectra is described. An empirical formula for the Stokes output spectral linewidth, a function of spontaneous Brillouin linewidth and the exponential gain coefficient, is obtained by the calculated data fitting. The formula holds true for two cases involving pump undepletion and depletion. The lineshape change from spontaneous to highly pump-depleted SBS spectra is also investigated. The result shows that for the pump power below the SBS threshold, the Stokes output spectral lineshape evolves from Lorentzian to approximately Gaussian as the pump power increases. For the pump power near or beyond the threshold, the SBS spectrum is in the form of a steady Gaussian profile, and the spectral linewidth comes to a certain value about 7 times narrower than the spontaneous one. The theoretical results are experimentally demonstrated by using several common liquid media.

Key words: Brillouin scattering, spectrum evolution, linewidth, lineshape

中图分类号:  (Brillouin and Rayleigh scattering; other light scattering)

  • 78.35.+c
78.20.-e (Optical properties of bulk materials and thin films) 42.55.Rz (Doped-insulator lasers and other solid state lasers)