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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.
Vitaly E. Gruzdev andKyle 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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Vitaly E. Gruzdev, 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