STIMULATED DYNAMIC LIGHT-SCATTERING

Stimulated dynamic light scattering (SDLS) in CS2 is studied by time-r esolved pump-density-dependent experiments in this paper. It is found that SDLS consists of two main contributions, one of which dominates a t the rise time of the pump pulse, and the other around the peak of th e high-density pump pulse. The former is related to molecular orientat ion, damped intermolecular vibration, and molecular trnaslation, while the latter is related to intermolecular interactions, Our experimenta l results demonstrate that the SDLS due to dipole interaction has a hi gher pump-power-density dependence than stimulated Raman scattering an d SDLS due to molecular motions. The present experimental results also demonstrate that the threshold of SDLS due to molecular motions depen ds on the pump-pulse duration. SDLS can be greatly enhanced by extendi ng the interaction length in a liquid-core waveguide. In our experimen ts, the efficiency of SDLS is nearly 100% and the frequency shift of S DLS covers hundreds of wave numbers in CS2 bulk liquid and 5000 cm(-1) in a CS2 liquid-core waveguide.