Efficient femtosecond pulse generation using a parabolic amplifier combined with a pulse compressor I Stimulated Raman-scattering effects

Femtosecond multiple - pulse impulsive stimulated Raman scattering spectroscopy

Optical control of elementary molecular motion through impulsive stimulated Raman scattering is enhanced by means of timed sequences of femtosecond pulses that are produced by pulse-shaping techniques. In particular, terahertz-rate trains of femtosecond pulses are used for repetitive impulsive excitation of individual phonon modes in an a-perylene molecular crystal. When the pulse repetition ra...

Femtosecond time-resolved Raman spectroscopy using stimulated Raman scattering

Femtosecond Raman spectroscopy has been developed to investigate ultrafast photoinduced structural changes of materials. Vibrational modes in the photogenerated transient species are measured by stimulated Raman scattering using a Raman pump pulse with narrow bandwidth and a femtosecond supercontinuum probe pulse. The Raman signal can be measured without slowing the temporal response and broade...

Manipulating Impulsive Stimulated Raman Spectroscopy with a Chirped Probe Pulse.

Photophysical and photochemical processes are often dominated by molecular vibrations in various electronic states. Dissecting the corresponding, often overlapping, spectroscopic signals from different electronic states is a challenge hampering their interpretation. Here we address impulsive stimulated Raman spectroscopy (ISRS), a powerful technique able to coherently stimulate and record Raman...

Amplification of an ultrashort pulse laser by stimulated Raman scattering of a 1 ns pulse in a low density plasma

Experiments are described in which a 1 mJ, 1 ps, 1200 nm seed laser beam is amplified by the interaction with an intersecting 350 J, 1 ns, 1054 nm pump beam in a low density 1 1019 /cm3 plasma. The transmission of the seed beam is observed to be enhanced by 25 when the plasma is near the resonant density for stimulated Raman scattering, compared to measured transmissions at wavelengths just bel...

Oblique Stimulated Raman Scattering of a Short Laser Pulse in a Plasma Channel