<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The availability of reliable modeling tools and input data required for the prediction of surface removal rate from the lithium fluoride targets irradiated by the intense photon beams is essential for many practical aspects. This study is motivated by the practical implementation of soft X-ray (SXR) or extreme ultraviolet (XUV) lasers for the pulsed ablation and thin film deposition. Specifically, it is focused on quantitative description of XUV laser-induced desorption/ablation from lithium fluoride, which is a reference large band-gap dielectric material with ionic crystalline structure. Computational framework was proposed and employed here for the reconstruction of plume expansion dynamics induced by the irradiation of lithium fluoride targets. The morphology of experimentally observed desorption/ablation craters were reproduced using idealized representation (two-zone approximation) of the laser fluence profile. The calculation of desorption/ablation rate was performed using one-dimensional thermomechanic model (XUV-ABLATOR code) taking into account laser heating and surface evaporation of the lithium fluoride target occurring on a nanosecond timescale. This step was followed by the application of two-dimensional hydrodynamic solver for description of laser-produced plasma plume expansion dynamics. The calculated plume lengths determined by numerical simulations were compared with a simple adiabatic expansion (blast-wave) model.</p></abstract>

The availability of reliable modeling tools and input data required for the prediction of surface removal rate from the lithium fluoride targets irradiated by the intense photon beams is essential for many practical aspects. This study is motivated by the practical implementation of soft X-ray (SXR) or extreme ultraviolet (XUV) lasers for the pulsed ablation and thin film deposition. Specifically, it is focused on quantitative description of XUV laser-induced desorption/ablation from lithium fluoride, which is a reference large band-gap dielectric material with ionic crystalline structure. Computational framework was proposed and employed here for the reconstruction of plume expansion dynamics induced by the irradiation of lithium fluoride targets. The morphology of experimentally observed desorption/ablation craters were reproduced using idealized representation (two-zone approximation) of the laser fluence profile. The calculation of desorption/ablation rate was performed using one-dimensional thermomechanic model (XUV-ABLATOR code) taking into account laser heating and surface evaporation of the lithium fluoride target occurring on a nanosecond timescale. This step was followed by the application of two-dimensional hydrodynamic solver for description of laser-produced plasma plume expansion dynamics. The calculated plume lengths determined by numerical simulations were compared with a simple adiabatic expansion (blast-wave) model.

Desorption/ablation of lithium fluoride induced by extreme ultraviolet laser radiation

Faculty of Mechanical Engineering, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, Ostrava-Poruba, CZ 708 33, Czech Republic

Faculty of Safety Engineering, VŠB-Technical University of Ostrava, Lumírova 13, Ostrava-Výškovice, CZ 700 30, Czech Republic

Faculty of Electrical Engineering and Computer Science, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, Ostrava-Poruba, CZ 708 33, Czech Republic

Faculty of Safety Engineering, VŠB-Technical University of Ostrava, Lumírova 13, Ostrava-Výškovice, CZ 700 30, Czech Republic and J. Heyrovský Institute of Physical Chemistry ASCR, Dolejškova 3, Praha 8, CZ 182 23, Czech Republic

Institute of Physics ASCR, Na Slovance 2, Prague 8, CZ 182 21, Czech Republic

J. Heyrovský Institute of Physical Chemistry ASCR, Dolejškova 3, Praha 8, CZ 182 23, Czech Republic

J. Heyrovský Institute of Physical Chemistry ASCR, Dolejškova 3, Praha 8, CZ 182 23, Czech Republic and Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Praha 8, CZ 180 00, Czech Republic

Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Praha 8, CZ 180 00, Czech Republic

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The availability of reliable modeling tools and input data required for the prediction of surface removal rate from the lithium fluoride targets irradiated by...

Desorption/ablation of lithium fluoride induced by extreme ultraviolet laser radiation

Pubblicato online: 15 giu 2016

Pagine: 131 - 138

Ricevuto: 30 set 2015

Accettato: 27 nov 2015

DOI: https://doi.org/10.1515/nuka-2016-0023

© by Václav Nevrlý

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.