Finite difference time domain method for simulation of damage initiation in thin film coatings

Linas Smalakys; Balys Momgaudis; Robertas Grigutis; Andrius Melninkaitis

doi:10.1117/12.2245297

6 December 2016 Finite difference time domain method for simulation of damage initiation in thin film coatings

Linas Smalakys, Balys Momgaudis, Robertas Grigutis, Andrius Melninkaitis

Author Affiliations +

Proceedings Volume 10014, Laser-Induced Damage in Optical Materials 2016; 100141W (2016) https://doi.org/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.

Citation Download Citation

Linas Smalakys, Balys Momgaudis, Robertas Grigutis, and 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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