Rotational Raman effects in the wake of optical filamentation.
The spatiotemporal effects generated in the wake of a laser filament propagating in nitrogen are investigated. At suitable time delays, a probe light pulse propagating along the wake experiences a strong spatial confinement and a noticeable spectral broadening at the same time. Numerical simulations, well reproducing the experimental findings, show the key role of the impulsive rotational Raman response in the observed phenomena.
National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM, Dipartimento di Fisica, Politecnico di Milano, Milano, I-20133, Italy. francesca.calegari@polimi.it
F
F
Calegari
C
C
Vozzi
S
S
Gasilov
E
E
Benedetti
G
G
Sansone
M
M
Nisoli
S
S
De Silvestri
S
S
Stagira