Modeling short-pulse laser excitation of dielectric materials

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  • Kristian Juncher Wædegaard, Denmark
  • Ditte Både Sandkamm, Denmark
  • Lasse Haahr-Lillevang, Denmark
  • Kathrine Glerup Bay, Denmark
  • Peter Balling
A theoretical description of ultrashort-pulse laser
excitation of dielectric materials based on strong-field excitation
in the Keldysh picture combined with a multiple-rateequation
model for the electronic excitation including collisional
processes is presented. The model includes light
attenuation in a self-consistent manner and changing optical
properties described in a Drude picture. The model can be
used to calculate the electronic excitation as a function of time
and depth, and from these quantities the time-dependent
optical parameters as well as the ablation depth can be
derived. The simulations provide insight into the excitation
and propagation dynamics of short-pulse excitation and show
that at increasing fluence the excitation becomes localized
near the material surface and gives rise to strongmodifications
of the optical properties of the material.
Original languageEnglish
JournalApplied Physics A: Materials Science & Processing
Publication statusPublished - 28 Jan 2014

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