Spatio-Temporal Dynamics of laser filamentation (postdeadline session)

I was looking forward to this session from the beginning, as everyone else did I guess.

The talk I am most interested in is the Spatio-Temporal Dynamics of Laser filamentation measured via Impulsive Raman Scattering. We have just done some filamentation experiment in methanol. It seems hard to find a way to characterize the filament. However, this group from center for advanced photonics research in Temple University characterizes the filament by

1: placing the 2 meter lens which is used to initiate filamentation on a translation stage and translating the filament through a 600 fs probe beam at 800 nm.

2: measuring the impulsive Raman of O2, N2 and H2O as a function of propagation length, which reveals the generation of ultrashort pulses less than 9fs;

3: inserting a thin piece of glass at near glancing angle along the filamentation and to measure the transmitted beam (0.01% energy) spectra therefore to get a power spectrum as a function of position, which suggests the blue side broadening occurs in two bursts. These spectral components results in the shortest pulses features of the filament.