异硫氰基孔雀石绿受激拉曼光谱研究

本文报道了具有时间分辨能力的全频宽带受激拉曼（BBSRS）系统和关于异硫氰基孔雀石绿（MGITC）受激拉曼光谱（sRs）的研究．BBSRS系统的探测光为450-800nm宽带连续白光，泵浦光为280～900nm范围内连续可调谐的ps窄带可见光（带宽≈7．5cm-1，脉宽≈2．5ps）．在合适的泵浦波长下，该系统可同时获取拉曼损失和拉曼增益光谱．MGITC的SRS研究结果表明，当拉曼损失谱峰出现在最大吸收波长（≈627nm）时，共振SRS谱峰强度最大；当泵浦或增益谱峰在最大吸收波长附近时，未观察到明显的共振拉曼信号；共振峰强度随浓度增大而增大，随泵浦功率增大而迅速增大，后趋于饱和；共振和非共振峰强在延时零点附近达到最大值，并随延时绝对值的增大而减小．

Stimulated Raman spectroscopy of malachite green isothiocyante

A broadband stimulated Raman scattering spectroscopy （SRS） setup have been developed and applied on the resonant SRS study of malachite green isothiocyanate （MGITC）. The broadband SRS system, which uses 450-800 nm white light continuum as Raman probe, and 280-900 nm tuning range （≈ 7.5 cm-1 spectral width and 2.5 ps pulse duration） narrow band picosecond pulse as Raman pump, allows for simultaneously recording the Raman loss and gain spetrum at proper pump wavelength. The resonant SRS peaks of MGITC reach the maximum when the peak positions fall around the absorption maximum of MGITC （ ≈ 627 nm）. The intensities of resonant SRS peaks rise with the increase of MGITC concentration, and rise rapidly with the increase of the pump power and then get saturated. The peak intensities of both resonant and non-resonant SRS peaks reach the maximum at time zero （zero delay between pump and probe pulses）, and decrease with the increase of separation between the pump and probe pulses in time.