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.
Calegari
F
F
National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM, Dipartimento di Fisica, Politecnico di Milano, Milano, I-20133, Italy. francesca.calegari@polimi.it
Vozzi
C
C
Gasilov
S
S
Benedetti
E
E
Sansone
G
G
Nisoli
M
M
De Silvestri
S
S
Stagira
S
S