在液芯光纤内产生共振拉曼效应,可以提高拉曼光谱强度109倍。用514.5 nm波长、0.80 mW激光,1.44 m光纤和60 mW激光,2.23 m光纤分别获得了浓度为2×10-9 mol/L和9.6×10-12 mol/L的β-胡罗卜素在CS2中的光纤共振剌曼光谱。实验中发现,低浓度下β-胡罗卜素拉曼光谱频移发生变化,并且,随着浓度的降低,其频移变化增大。

The resonance Raman effect is produced in a liquid core optical fiber. The Raman spectra intensity can be increased by 10 9 times. The resonance Raman spectrum of β carotene in CS 2 has been obtained. The concentration is 9.6×10 -12 mol/L. The laser power is 60 mW. The optical fiber length is 2.23 m, the inside diameter of the hollowcore optical fiber is 200 μm. In experiment we have found that frequency deviation of Raman spectra shifts when the concentration of β carotene in CS 2 is lower.