受激布里渊散射(SBS)的频移量远大于受激热散射(STS),达到GHz的量级;而STS的频移量很小,一般只有几十MHz;在以前的实验中,要区分这两种散射需要非常复杂的实验系统,或者高精度、大测量范围的光谱分析仪器,这在一般的实验室条件下是难于满足的.实验研究了掺杂Cu(NO3)2的丙酮溶液中产生的STS与纯丙酮中的SBS的频率响应.结果显示:随着泵浦能量的增加,SBS的线宽随机起伏,而STS的线宽有规律地变化.这可以替代高精度、大测量范围的光谱仪或者复杂系统而成为一种简便的区分STS和SBS的方法.据我们所知,目前文献中尚无相关报道.
In previous experiments the very complicated system or high-precision and large-range spectra-analysis apparatus was used to distinguish stimulated thermal scattering (STS) and stimulated Brillouin scattering (SBS) because the frequency shift of SBS is much larger than that of STS which is a few tens MHz generally, but the shift of SBS reaches several GHz typically.It will be difficult for common laboratorial conditions. Frequency responses of STS in Cu(NO3)2 colored acetone and SBS in pure acetone were investigated experimentally. It was showed that the linewidth of SBS fluctuated random and that of STS changed regularly as pump power increased. It can become a convenient and cheap approach to distinguish STS and SBS instead of high-precision and large-range spectrometer or complicated system. This method, as far as we know, has not been reported in references.
参考文献
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