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14 September 2020 Multiphoton absorption of ultrashort laser pulses in optical materials of multilayer coatings at near-damage-threshold fluence
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Abstract
Among the fundamental mechanisms of laser-induced damage of optical multilayers, multiphoton absorption is frequently addressed. The two most common models (the fixed-multiphoton-order model and the Keldysh model) of nonlinear absorption are invalid for optical-coating materials at laser fluence close to the LID threshold. An alternative approach is outlined in this presentation that considers a cosine band-structure model. Time-domain simulations suggest that the multiphoton order substantially deviates from its non-perturbed value at the peak of a laser pulse especially in wide-band-gap materials like fused silica. Simulations with the cosine model show that the Keldysh model significantly overestimates the multiphoton order. Based on those results, we discuss a method to correctly evaluate the pulse-averaged order of multiphoton absorption.
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© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vitaly E. Gruzdev and Kyle Kafka "Multiphoton absorption of ultrashort laser pulses in optical materials of multilayer coatings at near-damage-threshold fluence", Proc. SPIE 11514, Laser-induced Damage in Optical Materials 2020, 115141Y (14 September 2020); https://doi.org/10.1117/12.2572553
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