用染料激光增益降低二元混合物中少量化合物的受激拉曼散射可探测浓度

在二元混合物构成的圆形谐振腔中,用染料的激光增益增强了少量化合物(乙醇溶液中的甲醇、水溶液中的乙醇)的受激拉曼散射（SRS）光谱,将少量化合物在悬垂液滴中的瞬态SRS探测极限提高了近一个数量级. 用受激拉曼散射理论,解释了增强少量化合物SRS的机理. 关键词： 受激拉曼散射 染料激光增益 二元混合物 最小可探测浓度

Enhancement of stimulated Raman scattering of minority species of binary mixture in pendant drops by dye lasing gain

The enhancement of stimulated Raman scattering (SRS) of minority species of binary mixture is demonstrated in pendant drops by overlapping the Stokes wavelengths of the Raman modes of minority species with Rhodamine 640 dye lasing gain. The limit of detectable concentration for the minority species,methanol in methanol_ethanol and ethanol in ethanol_water mixtures,is greatly reduced. Based on the theory of SRS,the mechanism for enhancing SRS of minority species is explained.