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The mechanisms related to the formation and propagation of post-filamentation intense light channels were rigorously investigated experimentally and numerically. It was found that they originate from a hot spot formed by diffraction of the pulse energy reservoir onto the plasma. Once the hot spot was formed, a channel with intensity estimated at 0.5TW/cm 2 could maintain its diameter over...
Photonic crystal filaments were demonstrated with noncollinear filaments interaction, resulting in elongated filaments and third harmonic generation of more than two orders enhancement as compared with that from a single filament.
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