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

Transition from plasma- to Kerr-driven laser filamentation