Abstract
A theoretical description of ultrashort-pulse laser excitation of dielectric materials based on strong-field excitation in the Keldysh picture combined with a multiple-rate-equation 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 strong modifications of the optical properties of the material.
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Notes
Note that we are here deriving the expressions in terms of the intensity, while in [4] a photon-density expression was used. The expressions in terms of intensity are slightly more intuitive and make some of the numerical-modeling steps simpler.
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Wædegaard, K., Sandkamm, D.B., Haahr-Lillevang, L. et al. Modeling short-pulse laser excitation of dielectric materials. Appl. Phys. A 117, 7–12 (2014). https://doi.org/10.1007/s00339-014-8231-8
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DOI: https://doi.org/10.1007/s00339-014-8231-8