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11 September 2020 2D dynamic ionization simulation from ultrashort pulses in multilayer dielectric interference coatings
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Abstract
The interaction of ultrafast laser pulses and dielectric materials has been under intensive research for improvement of laser damage of thin film optics. A 2D model based on Keldysh model and finite-different time-domain (FDTD) integration was developed to simulate the ionization dynamics in multilayer interference coatings, taking nonlinear photoionization, collisional ionization, plasma absorption, and electron thermal energy into account. Comparisons of simulation and experimental results of bulk fused silica with different pulse durations are compared and discussed. We also simulated ionization dynamics in 40-layer SiO2/Ta2O5 HR coatings during a 5-fs pulse that is p- polarized, and the damage threshold of the coating is also estimated.
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© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Simin Zhang, Aaron Davenport, Noah Talisa, Joseph R Smith, Carmen Menoni, Vitaly Gruzdev, and Enam Chowdhury "2D dynamic ionization simulation from ultrashort pulses in multilayer dielectric interference coatings", Proc. SPIE 11514, Laser-induced Damage in Optical Materials 2020, 115141T (11 September 2020); https://doi.org/10.1117/12.2571081
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