The availability of reliable modeling tools and input data required for the prediction of surface removal
rate from the lithium fluoridetargets 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 fi lm 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 fluoridetargets. 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 fluoridetarget 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. The availability of reliable modeling tools and input data required for the prediction of surface removal
rate from the lithium fluoridetargets 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 fi lm 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 fluoridetargets. 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 fluoridetarget 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.
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