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Proceedings Paper

Finite difference time domain method for simulation of damage initiation in thin film coatings
Author(s): Linas Smalakys; Balys Momgaudis; Robertas Grigutis; Andrius Melninkaitis
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Paper Abstract

Time resolved digital holography (TRDH) is a versatile tool that provides valuable insights into the dynamics of femtosecond damage initiation by providing spatiotemporal information of excited material. However, interpreting of TRDH data in thin film dielectric coatings is rather complicated without appropriate theoretical models that are able to correctly describe underlying nature of damage formation. Therefore, a model based on finite difference time domain (FDTD) method with complete Keldysh theory for nonlinear ionization of atoms and multiple rate equation (MRE) method for conduction band electrons was developed. The model was used to reproduce both temporal and spatial characteristics of TRDH experiment performed on Ta2O5 dielectric coating. Fitted material parameters were then applied to indirectly estimate LIDT of the coating.

Paper Details

Date Published: 6 December 2016
PDF: 9 pages
Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100141W (6 December 2016); doi: 10.1117/12.2245297
Show Author Affiliations
Linas Smalakys, Vilnius Univ. (Lithuania)
Balys Momgaudis, Vilnius Univ. (Lithuania)
Robertas Grigutis, Vilnius Univ. (Lithuania)
Andrius Melninkaitis, Vilnius Univ. (Lithuania)

Published in SPIE Proceedings Vol. 10014:
Laser-Induced Damage in Optical Materials 2016
Greg J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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