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Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2005

Filamentation and damage in fused silica induced by tightly focused femtosecond laser pulses

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Abstract

We investigate experimentally and numerically the damage tracks induced by tightly focused (NA=0.5) infrared femtosecond laser pulses in the bulk of a fused silica sample. Two types of irreversible damage are observed. The first damage corresponds to a permanent change of refractive index without structural modifications (type I). It appears for input pulse energies beyond 0.1 μJ. It takes the form of a narrow track extending over more than 100 μm at higher input powers. It is attributed to a change of the polarizability of the medium, following a filamentary propagation which generates an electron-hole plasma through optical field ionization. A second type of damage occurs for input pulse energies beyond 0.3 μJ (type II). It takes the form of a pear-shaped structural damage associated with an electron-ion plasma triggered by avalanche. The temporal evolution of plasma absorption is studied by pump-probe experiments. For type I damage, a fast electron-hole recombination is observed. Type II damage is linked with a longer absorption.
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Dates and versions

hal-00463614 , version 1 (13-03-2010)

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Arnaud Couairon, Lionel Sudrie, Michel A. Franco, Bernard Prade, André Mysyrowicz. Filamentation and damage in fused silica induced by tightly focused femtosecond laser pulses. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 71 (12), pp.125435. ⟨10.1103/PhysRevB.71.125435⟩. ⟨hal-00463614⟩
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