Multipass Lock-In Thermography for optical coating absorption measurements

Camille Petite; Remi Marcouille; Antonin Moreau; Hélène Krol; Catherine Grezes-Besset; Julien Lumeau; Laurent Gallais

doi:10.1117/12.2603979

12 October 2021 Multipass Lock-In Thermography for optical coating absorption measurements

Camille Petite, Remi Marcouille, Antonin Moreau, Hélène Krol, Catherine Grezes-Besset, Julien Lumeau, Laurent Gallais

Proceedings Volume 11910, Laser-Induced Damage in Optical Materials 2021; 119101G (2021) https://doi.org/10.1117/12.2603979
Event: SPIE Laser Damage, 2021, Online Only

Conference Poster

Abstract

The development of high power lasers implies specific needs of optics with very low absorption to avoid detrimental thermal effects up to damage of optical components, and associated metrology of these optics. In this work, we discuss on our recent developments of a thermographic-based technique to measure absorption: specifically, the Lock-In Thermography (LIT) technique applied in a multipass configuration to increase the effective power on the tested samples. We will present the system developed at the Institut Fresnel that is based on 1.5 kW Ytterbium fiber, that allows to submit samples to 5 kW effective power and measure absorption levels down to the ppm on optical coatings.

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Citation Download Citation

Camille Petite, Remi Marcouille, Antonin Moreau, Hélène Krol, Catherine Grezes-Besset, Julien Lumeau, and Laurent Gallais "Multipass Lock-In Thermography for optical coating absorption measurements", Proc. SPIE 11910, Laser-Induced Damage in Optical Materials 2021, 119101G (12 October 2021); https://doi.org/10.1117/12.2603979

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