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Characterization of conical emission of light filaments in media with anomalous dispersion

Miguel A. Porras, Audrius Dubietis, Aidas Matijošius, Rimtautas Piskarskas, Francesca Bragheri, Alessandro Averchi, and Paolo Di Trapani

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Abstract

Conical emission featuring a diminishing emission angle with increasing wavelength detuning is observed in ultrashort light filaments in fused silica at a carrier wavelength with anomalous dispersion. In the measured angularly resolved spectrum of the filament, this conical emission appears as an elliptical, or O-like, structure that fits quantitatively to the elliptical spectrum of gain in the Kerr-driven spatiotemporal instability of nonlinear plane waves.

© 2007 Optical Society of America

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