液芯光纤中溶液吸收和荧光的性质对CS_2受激拉曼散射阈值的影响

The influence of absorption and fluorescence from the solution on the stimulated Raman threshold of CS_2 in liquid-core optical fiber

利用液芯光纤技术研究了不同浓度的β-Carotene的CS2溶液的吸收与荧光的特性对CS2的一、二阶Stokes谱线阈值的影响.实验发现随溶液浓度(10-8—10-6mol/L)增加,CS2的一阶Stokes谱线的激发阈值相对变高;并且与纯CS2芯液的受激拉曼散射相比较,在低抽运能量激发下,就观察到CS2的二阶Stokes谱线.这主要是由于在CS2的受激拉曼谱线产生的过程中,β-Carotene的CS2溶液的吸收和荧光共同影响了CS2的一、二阶Stokes谱线的阈值.我们进行了理论上的拟合与分析,其结果与实验符合很好.

It is shown from experiments that the stimulated Baman thresholds of the first and the second Stokes lines of CS2 are influenced by the absorption and fluorescence from the solution of β-Carotene in CS2 in liquid core optical fiber. The threshold of the first Stokes line of CS2 becomes higher when the concentration of the solution increases. And the second Stokes line of CS2 can be observed at a lower pump energy in the solution of β-Carotene in CS2 compared with that of the solution of pure CS2 . Then the theoretic explanations are given and the theoretic results agree well with the experimental results.