Schulz Emilia, Steingrube Daniel S, Binhammer Thomas, Gaarde Mette B, Couairon Arnaud, Morgner Uwe, Kovačev Milutin
Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, D-30167 Hannover, Germany.
Opt Express. 2011 Sep 26;19(20):19495-507. doi: 10.1364/OE.19.019495.
The spectral evolution of a high-intensity light channel formed by filamentation is investigated in a detailed experimental study. We also track the spatio-temporal dynamics by high-order harmonic generation along the filament. Both the spectral and temporal diagnostics are performed as a function of propagation distance, by extracting the light pulses directly from the hot filament core into vacuum via pinholes that terminate the nonlinear propagation. We compare the measured spectral shapes to simulations and analyze numerically the temporal dynamics inside the filament.