光纤共振和预共振喇曼光谱(英)

OPTICAL FIBER RESONANCE AND PRERESONANCERAMAN SPECTRA

在液芯光纤内产生共振和预共振喇曼效应，喇曼光谱强度可以大幅度提高，最高可达109倍．本文介绍获得光纤（预）共振喇曼光谱的可行性、实验及实验结果．用远离吸收带的激光激发获得了α甲基吡啶预共振喇曼光谱．用小功率激光（0．8mW）、低浓度溶液（9．6×10(-12)mol／L）还获得了β叶红素在CS2中的共振喇曼光谱．

The resonance and preresonance Raman effect are produced in liquidcore optical fibers,enhancing the Raman spectral intensity by 1 09 times. The feasibility and experiment method for obtaining resonance and preresonance Raman spectra in liquidcore optical fiber are discussed. The preresonance Raman spectra of α-picoline have been obtained with the excitation laser at 514. 5, 488. 0and 4 5 4. 5 nm respectively. The exciting wavelength is longer than that of the absorption band of α-picoline molecules. The resonance Raman spectra of β-carotene in CS2 have been obtained with the less excitation power (0. 80mW),and the resonance Raman spectra of low concentration sample (3. 4×10(-13)mol/L) have been also obtained.