Abstract
Filamentation during simultaneous space-time focusing in bulk fused silica is
investigated numerically. We model the use of a pair of concentric gratings to
transform a common femtosecond laser pulse with a Gaussian spatial profile into
a radially chirped, annular beam shape that is focused into the bulk of silica
by a lens. By varying the energy and/or time-chirp of the incident pulse, we
capture the pulse dynamics and material response that yields material
modification and damage in the nonlinear focus. The results show rich pulse
dynamics, enhanced damage/modification site localization, and suggest novel
approaches to laser machining of solids.
© 2016 Optical Society of America
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