选用混合介质优化介质和控制受激布里渊散射特性的研究

Optimization of medium and control characteristics of stimulated Brillouin scattering based on mixed media

本文提出了选用混合介质优化介质和控制其SBS特性的方案.分析了全氟碳化合物系列液体介质具有良好互溶性的缘故,数值模拟了HT-230/FC-72混合介质的增益系数、声子寿命和布里渊频移随混合比的变化曲线.在CountinuumNd:YAG种子注入激光系统中测定了HT-230/FC-72混合介质的吸收系数和光学击穿阈值随混合比的变化,并实验研究了混合介质的能量反射率和Stokes光脉冲波形随混合比的变化.通过选用混合介质不仅优化介质,而且在一定范围之内可控制其SBS特性.

In this paper,the optimization of medium and control characteristics of stimulated Brillouin scattering （ SBS） based on mixed media is investigated. The excellent intersolubility of perfluorocarbon liquid media is analyzed and the dependence of gain coefficient,phonon lifetime and Brillouin frequency shift of HT-230 /FC-72 mixed media on mixingratio is numerically simulated. In Countinuum ’s Nd： YAG seed-injected laser system, we measured absorption coefficient,optical breakdown threshold,energy reflectivity and Stokes pulses waveform of HT-230 /FC-72 mixture under different mixing-ratio. The results indicate that the mixed media not only can optimize the medium,but also can control the characteristics of SBS within a certain range.