28 November 2013 Collision frequencies and absorption calculations for ultra-short laser interactions with dielectric materials
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Proceedings Volume 9065, Fundamentals of Laser-Assisted Micro- and Nanotechnologies 2013; 906506 (2013) https://doi.org/10.1117/12.2051616
Event: Fundamentals of Laser Assisted Micro- and Nanotechnologies 2013, 2013, St. Petersburg, Russian Federation
Abstract
Laser-induced electronic excitation, absorption and relaxation are the key issues in ultra-short laser interactions with dielectric materials. To numerically analyze these processes, a detailed non-equilibrium model is developed based on the kinetic Boltzmann equations without any appeal to the classical Drude model. The calculations are performed including all possible collisional processes. As a result, electron energy distributions are obtained allowing a better analysis of ultra-short laser interactions. A remarkable effect of the laser-field on collision frequencies is demonstrated leading to smaller free-carriers absorption than the one predicted by Drude model with a non-field dependent collision frequency. Both electron-electron and electron-phonon relaxation are then examined, and the mean energy density of the electron sub-system is investigated as a function of laser fluence and pulse duration. The developed model is useful for many laser applications including high precision in laser treatment, laser-assisted atomic probe tomography, and for the development of new powerful laser systems.
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Tatiana E. Itina, Tatiana E. Itina, Nikita S. Shcheblanov, Nikita S. Shcheblanov, "Collision frequencies and absorption calculations for ultra-short laser interactions with dielectric materials", Proc. SPIE 9065, Fundamentals of Laser-Assisted Micro- and Nanotechnologies 2013, 906506 (28 November 2013); doi: 10.1117/12.2051616; https://doi.org/10.1117/12.2051616
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