Determining the bandgap dependence of nonlinear absorption and laser induced damage threshold through numerical simulation and experiment

Joshua McCauley; Xiaochuan Ji; Marco Jupé; Jinlong Zhang; Andreas Wienke; Detlev Ristau

doi:10.1117/12.2685160

24 November 2023 Determining the bandgap dependence of nonlinear absorption and laser induced damage threshold through numerical simulation and experiment

Joshua McCauley, Xiaochuan Ji, Marco Jupé, Jinlong Zhang, Andreas Wienke, Detlev Ristau

Author Affiliations +

Proceedings Volume 12726, Laser-Induced Damage in Optical Materials 2023; 127260J (2023) https://doi.org/10.1117/12.2685160
Event: SPIE Laser Damage, 2023, Dublin/Livermore, California, United States

Abstract

Nonlinear absorption is mainly governed by mechanisms involving excitation processes of electrons. Typically, two phenomena are considered when discussing nonlinear absorption; the multiphoton absorption where multiple photons interact directly with a single electron, and tunnel ionization, where the high electric field results in a shifting of the bandgap allowing an electron to tunnel into the conduction band. Electrons in the conduction band can be accelerated through the absorption of further photons until they obtain enough energy to excite further electrons to the conduction band, leading to runaway absorption and finally damage of the sample. By laser calorimetric measurement of the nonlinear absorption, it is expected that the laser damage threshold can be predicted without damaging the optic. Before accurate predictions can be made, the process must be thoroughly characterized and understood. The nonlinear behavior of the absorption was demonstrated with potential increases in absorption of an order of magnitude. Initial results show a noticeable impact of contaminants, though a nonlinear response is still observed.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Joshua McCauley, Xiaochuan Ji, Marco Jupé, Jinlong Zhang, Andreas Wienke, and Detlev Ristau "Determining the bandgap dependence of nonlinear absorption and laser induced damage threshold through numerical simulation and experiment", Proc. SPIE 12726, Laser-Induced Damage in Optical Materials 2023, 127260J (24 November 2023); https://doi.org/10.1117/12.2685160

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