Self-pinching of pulsed laser beams during filamentary propagation.
Competing nonlinear optical effects that act on femtosecond laser pulses propagating in a self-generated light filament may give rise to a pronounced radial beam deformation, similar to the z-pinch contraction of pulsed high-current discharges. This self-generated spatial beam contraction is accompanied by a pulse break-up that can be beneficially exploited for on-axis temporal compression of the pulse. The pinching mechanism therefore explains the recently observed self-compression and the complicated spatio-temporal shapes typical for filament propagation experiments.
Brée
Carsten
C
Weierstrass-Institut für Angewandte Analysis und Stochastik (WIAS), 10117 Berlin, Germany. bree@wias-berlin.de
Demircan
Ayhan
A
Skupin
Stefan
S
Bergé
Luc
L
Steinmeyer
Günter
G