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

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【Author】 Gao Weia)b), Lü Zhi-Weia), He Wei-Minga), Hasi Wu-Li-Jia), and Zhang Zana) 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

【机构】 Institute of Opto-Electronics, Harbin Institute of Technology； Department of Applied Physics, Harbin University of Science and Technology；

【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 coeffcient, 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.更多还原

【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 coeffcient, 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.更多还原

【关键词】 Brillouin scattering； spectrum evolution； linewidth； lineshape；
【Key words】 Brillouin scattering； spectrum evolution； linewidth； lineshape；

【基金】 Project supported by the National Natural Science Foundation of China (Grant No 60778019);the Program of Excellent Teamin Harbin Institute of Technology, China;the Program of Science and Technology of Education the Bureau of Heilongjiang Province, China (Grant No 11521048)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2008年10期

【分类号】O437.2
【被引频次】3
【下载频次】36

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