Theoretical investigations of material modification using temporally shaped femtosecond laser pulses |
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Authors: | IM Burakov NM Bulgakova R Stoian A Rosenfeld IV Hertel |
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Institution: | (1) Institute of Thermophysics SB RAS, 1 Lavrentyev Ave., 630090 Novosibirsk, Russia;(2) Laboratoire TSI (UMR 5516 CNRS), Université Jean Monnet, 10 rue Barrouin, 42000 Saint Etienne, France;(3) Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born Str. 2a, 12489 Berlin, Germany;(4) Department of Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin, Germany |
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Abstract: | We present a two-dimensional model, based on a drift–diffusion approach, developed to describe the dynamics of electronic
excitation and lattice heating in several dielectric materials with different electron–phonon coupling properties (e.g. fused
silica and sapphire) under the action of femtosecond near-infrared laser pulse trains with variable separation time between
pulses. The modeling approach was aimed to describe the mechanisms that enable the spatial modulation of the structures induced
by temporally modulated laser excitation and ablation of wide-band-gap dielectric materials. The possible geometric contours
of the laser-induced craters on the target surfaces are discussed on the basis of the lattice-temperature profiles obtained
by modeling. It was found that the observed difference in the crater shapes generated in fused silica and sapphire is conditioned
by the difference in dynamics of electron excitation and recombination channels characteristic of these two materials. This
effect can be used to convert a given temporal pulse modulation into spatial modulation, opening up new perspectives for material
processing in order to obtain desired structure profiles.
PACS 79.20.Ds; 42.62.-b |
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