Transition from plasma- to Kerr-driven laser filamentation

Details Transition from plasma- to Kerr-driven laser filamentation Transition from plasma- to Kerr-driven laser filamentation

2011-03-08

arxiv.org/abs/1103.1467v2

Physical Review Letters 106, 243902 (2011)

Physics

Optics

6 pages, 4 figures. Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.106.243902

While filaments are generally interpreted as a dynamic balance between Kerr focusing and plasma defocusing, the role of the higher-order Kerr effect (HOKE) is actively debated as a potentially dominant defocusing contribution to filament stabilization. In a pump-probe experiment supported by numerical simulations, we demonstrate the transition between two distinct filamentation regimes at 800\,nm. For long pulses (1.2 ps), the plasma substantially contributes to filamentation, while this contribution vanishes for short pulses (70 fs). These results confirm the occurrence, in adequate conditions, of filamentation driven by the HOKE rather than by plasma.

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