Synchronization of ultrafast pulses and pulse front tilt removal inside samples
Résumé
Ultrafast imaging requires accurate synchronization of pump and probe pulses, as well as the removal of anypulse front tilt of the probe pulse. Indeed, any pulse front tilt is highly detrimental to the accuracy of the imagingtechnique. In addition, the ”zero delay” between pump and probe is only true for a specific propagation distance.This is because along the path of pump and probe beams, the dispersion strongly modifies the retardance betweenthe pulses. As an example, for pump and probe beams in a collinear configuration, the propagation through 100 µmthick glass slide is enough to induce a shift by more than 37 fs between 800 nm and 400 nm pulses because of thedifference in terms of refractive index. However, it is extremely difficult to characterize weak probe pulses.
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