GENERATION OF FREQUENCY SHIFTED PICOSECOND PULSES WITH LOW TEMPORAL JITTER

Transient stimulated Raman scattering isused for the generation of a frequency shifted picosecond light pulse; part of this Raman shifted pulse is subsequently coherently scattered at a material excitation of a second Raman cell. Starting with the second harmonic pulse (tp = 4 ps) of a mode-locked Nd: glass laser system, both the stimulated and the coherently pro-duced pulses have durations of 2.3 ps at different wavelengths. Bythe appropriate choice of the Raman medium pulses be-tween 13 000 and 21 000 cm-1 can be generated. The coherent generation process minimizes the temporal jitter between the two pulses and allows to obtain a high time resolution of better than 0.3 ps in excite and probe experiments. 1