Interaction of dielectrics with femtosecond laser pulses: application of kinetic approach and multiple rate equation |
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Authors: | B Rethfeld O Brenk N Medvedev H Krutsch D H H Hoffmann |
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Institution: | (1) Department of Physics, City College of CUNY, Convent Ave &, 138th Street, New York, NY 10031, USA;(2) Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA |
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Abstract: | We calculate the transient free-electron density in laser-irradiated dielectrics with two different approaches, both considering
the energy distribution of excited electrons. The kinetic approach solves a system of complete Boltzmann collision integrals
describing different excitation and relaxation processes in detail. The multiple rate equation (MRE) is an approximative way
to keep track of the energy distribution of excited electrons with reduced numerical effort. Both methods are applied to trace
dielectric breakdown, considering the changing optical parameters during irradiation with a high-intensity laser pulse. In
the MRE approach we include also fast recombination, leading to a delay of the increase of the electronic density and to a
decrease of the maximum number of free electrons. |
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