Modelling extreme ultraviolet ablation interactions

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Compact extreme ultraviolet (EUV) laser sources can be used for laboratory-scale ablation experiments at intensities of 1 x 10^11 Wcm^-2 and higher. The depths of ablation achieved using focused laser output at 46.9 nm to irradiate solid targets of aluminium, gold and copper have been modeled. Two simple models are considered; an adaption of an ultra-short pulse model, and an ablation velocity model. We show that the attenuation length of the material plays an important role in the physics of the ablation. A more detailed one-dimensional model including absorption by inverse bremsstrahlung absorption and photo-ionization, corrected to include electron degeneracy effects, is used to evaluate the opacity of the ablation plasma and subsequent ablation depths.
Original languageEnglish
Title of host publicationProceedings Volume 11035, Optics Damage and Materials Processing by EUV/X-ray Radiation VII; 110350R (2019)
PagesR1- R8
Number of pages8
Publication statusPublished - 24 Apr 2019

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