Abstract

Filamentation dynamics in fused silica are investigated using an Airy pattern and a Gaussian laser beam. The angle-resolved conical emission spectra are measured and compared with the predictions of several models. Our experimental observations are consistent with the $X$-waves model in both cases. This indicates that both laser beams spontaneously evolve into nonlinear $X$-waves and suggests a universal evolution of filaments in fused silica, regardless of the initial laser beam profile.

© 2016 Optical Society of America

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