Absorption measurement and simulation of photo induced effects in thin-film optical filters

Mathias Soulier; Laurent Gallais; Julien Lumeau; Serge Monneret; Hélène T. Krol

doi:10.1117/12.3017404

24 June 2024 Absorption measurement and simulation of photo induced effects in thin-film optical filters

Mathias Soulier, Laurent Gallais, Julien Lumeau, Serge Monneret, Hélène T. Krol

Proceedings Volume 13020, Advances in Optical Thin Films VIII; 130200B (2024) https://doi.org/10.1117/12.3017404
Event: SPIE Optical Systems Design, 2024, Strasbourg, France

Abstract

The rapid progress in high-power laser technology requires an in-depth investigation of absorption within optical components, as well as a comprehensive understanding of photo induced effects in thin film stacks. For this purpose, Lock-In Thermography (LIT) setup has been developed to measure the total absorption of the coatings with sensitivity under 1 ppm. A modulated high power laser is used to induce heating into the coating stack, and the resulting internal temperature rise is measured with a thermal camera. The LIT experimental setup offers a non-destructive and non-contact measurement technique which enables mapping of absorbing defects and implementing other types of measurement (such as wavefront distortion) in the same set up. To theoretically study the photo induced effects in a thin film stack subjected to high-power laser heating, a finite element model has also been developed. This model provides an insight on the refractive index and thickness variations of each layer and allows to predict the spectral shift in optical function. From stress-induced deformation computation, the model can also assess wavefront deformations resulting from photo induced effects. Using these tools, we show a comparison of measured and modelled spectral shift of thin-film components under high power laser exposure. These results offer valuable insights into the impact of laser-induced heating on the optical properties of the coatings and provide guidelines for designing robust and reliable thin-film optical filters used with high power lasers.

Conference Presentation

Citation Download Citation

Mathias Soulier, Laurent Gallais, Julien Lumeau, Serge Monneret, and Hélène T. Krol "Absorption measurement and simulation of photo induced effects in thin-film optical filters", Proc. SPIE 13020, Advances in Optical Thin Films VIII, 130200B (24 June 2024); https://doi.org/10.1117/12.3017404

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