分子间费米共振论文分子间费米共振对拉曼散射影响的研究.docVIP

分子间费米共振论文：分子间费米共振对拉曼散射影响的研究 【中文摘要】论文对液芯光纤中甲苯和间二甲苯混合溶液的拉曼散射光谱进行了研究,利用分子间费米共振增强了混合溶液的受激拉曼散射(SRS)。分别测得了混合溶液的自发拉曼和受激拉曼光谱。讨论了溶液的不同混合比例与拉曼散射截面、峰值强度、阈值等的变化关系。从实验结果表明,在甲苯和间二甲苯不同体积比的溶液中拉曼频移量为1002 cm-1的v1线和频移量为2920 cm-1,3058 cm-1的v2线的三种振动形式同时受激,v2的一阶斯托克斯(Stokes) I阈值低于v1的二阶Stokes阈值,并且v2中的两条Stokes线随着溶液体积比的不同相继成为主峰。我们认为这种现象产生的主要机理是分子间的费米共振对拉曼散射的影响。并利用拉曼散射截面理论来进行了合理的解释。实验结果与理论相吻合,混合溶液的SRS在可调谐光纤激光器,拉曼放大器等方面有着广泛的应用前景。 【英文摘要】In this paper, stimulated Raman scattering of toluene and m-xylene, mixed solution in liquid core optical fibers was studied. Stimulated Raman scattering in this mixed solution was enhanced by intermolecular Fermi resonance. Spontaneous and stimulated Raman scattering spectrum of the mixed solution were measured. Effect of mixture ratio on Raman scattering cross section, peak intensity and threshold were discussed.The experimental results showed that, in toluene and m-xylene mixed solution with different mixture ratio, the following three modes of vibration were stimulated simultaneously:v1 line with the Raman frequency shift of 1002 cm-1, v2 line with the Raman frequency shift of 2920 cm-1 and 3058 cm-1. First order Stokes threshold of v2 line is lower than second order Stokes threshold of v1 line, and the two Stokes lines in v2 became the major peak in succession under different mixture ratio. We considered the mechanism of this phenomenon was effect of intermolecular Fermi resonance on Raman scattering and presented reasonable interpretation using theory of Raman scattering cross section. The experimental results were identical with theory. SRS in mixed solution has wide perspective in tunable fiber laser, Raman amplifier and etc. 【关键词】分子间费米共振 受激拉曼散射 拉曼散射截面 【英文关键词】intermolecular Fermi resonance stimulated Raman scattering Raman scattering cross section 【目录】分子间费米共振对拉曼散射影响的研究 摘要 4-5 ABSTRACT 5 目录 6-7 第一章 绪论 7-11 1.1 拉曼散射以及拉曼散射光谱研究意义 7-8 1.2 费米共振研究意义 8 1.3 光纤技术及其在拉曼光谱学研究中的应用 8-9 1.4 本论文主要研究内容 9-11 第二章 拉曼散射与费米共振理论 11-28 2.1 拉曼散射原理 11-16 2.2 费米共振原理 1