6 December 2016 Finite difference time domain method for simulation of damage initiation in thin film coatings
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Proceedings Volume 10014, Laser-Induced Damage in Optical Materials 2016; 100141W (2016); doi: 10.1117/12.2245297
Event: SPIE Laser Damage, 2016, Boulder, Colorado, United States
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.
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Linas Smalakys, Balys Momgaudis, Robertas Grigutis, Andrius Melninkaitis, "Finite difference time domain method for simulation of damage initiation in thin film coatings", Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100141W (6 December 2016); doi: 10.1117/12.2245297; https://doi.org/10.1117/12.2245297
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KEYWORDS
Electrons

Excitons

Finite-difference time-domain method

Thin film coatings

Dielectrics

Ionization

Data modeling

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