Multiphoton absorption of ultrashort laser pulses in optical materials of multilayer coatings at near-damage-threshold fluence

Vitaly E. Gruzdev; Kyle Kafka

doi:10.1117/12.2572553

14 September 2020 Multiphoton absorption of ultrashort laser pulses in optical materials of multilayer coatings at near-damage-threshold fluence

Vitaly E. Gruzdev, Kyle Kafka

Author Affiliations +

Proceedings Volume 11514, Laser-induced Damage in Optical Materials 2020; 115141Y (2020) https://doi.org/10.1117/12.2572553
Event: SPIE Laser Damage, 2020, Online Only

Conference Poster

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.

Conference Presentation

Citation Download Citation

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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