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摘要:在一般情况下,任何介质内部均存在着由于大量质点统计热运动所引起的弹性声波场振动.这种弹性声波场运动可分解为无数单色简谐平面波的运动将引起介质密度随空间和时间的周期性起伏变化,此时,整个介质的光学特性类似于一个运动着的三维光栅,因此能引起入射光波场的衍射(即散射)效应.在实验中得到了受激布里渊(SBS)谱,并从而计算了SBS频移、Stokes线宽、声速等.NaCl水溶液的浓度因素对NaCl的SBS影响,可由实验得到.受激布里渊频移和声速都随浓度的增加而增加.含NaCl水溶液声速大于纯水中
Abstract: In general, there are elastic acoustic wave field vibrations caused by a large number of particle statistical thermal motions inside any medium. The motion of this elastic acoustic wave field can be decomposed into motions of numerous monochrome simple harmonic plane waves that will cause the medium density to follow the space. And the periodic fluctuations of time and time, at this time, the optical properties of the entire medium are similar to a moving three-dimensional grating, so it can cause the diffraction (ie scattering) effect of the incident light wave field. Stimulated Brillouin was obtained in the experiment. SBS spectrum, and thus calculated SBS frequency shift, Stokes line width, speed of sound, etc. The effect of concentration of NaCl aqueous solution on the SBS of NaCl can be obtained experimentally. Both the stimulated Brillouin frequency shift and the sound speed increase with the increase of the concentration. The speed of sound of NaCl-containing aqueous solution is greater than pure water