Broadband, 920-nm mirror thin film damage competition

Raluca A. Negres; Kyle R. P. Kafka; Chris Smith; Marek Stehlik; Sarah Olandt; Stavros G. Demos; Amy Rigatti

doi:10.1117/12.2685127

24 November 2023 Broadband, 920-nm mirror thin film damage competition

Raluca A. Negres, Kyle R. P. Kafka, Chris Smith, Marek Stehlik, Sarah Olandt, Stavros G. Demos, Amy Rigatti

Proceedings Volume 12726, Laser-Induced Damage in Optical Materials 2023; 1272606 (2023) https://doi.org/10.1117/12.2685127
Event: SPIE Laser Damage, 2023, Dublin/Livermore, California, United States

Abstract

This year’s competition proposed to survey the state-of-the-art broadband, near-IR multilayer dielectric (MLD) mirrors designed for ultra-short, pulsed laser applications. The requirements for the coatings were a minimum reflection of 99.5% at 45-degree incidence angle for S-polarization from 830 nm to 1010 nm and group delay dispersion (GDD) < ± 50 fs². The participants in this effort selected the coating materials, coating design, and deposition method. Samples were damage tested at a single testing facility to enable direct comparison among the participants using a 25 ± 5 fs OPCPA laser system operating at 5 Hz. A double blind test assured sample and submitter anonymity. The damage performance results, sample rankings, details of the deposition processes, coating materials and substrate cleaning methods are shared here. We found that multilayer coatings using tantala and/or hafnia as high index materials were top performers within several coating deposition groups. Specifically, dense coatings by ion-beam sputtering (IBS), magnetron sputtering (MS), and electron-beam ion assisted deposition (e-beam IAD) exhibited highest damage initiation onset (LIDT) while e-beam coatings were low performers. In addition, damage growth onset (LDGT) was also examined and the results are reported here for all samples as this performance metric plays an important role in establishing the safe operational conditions for larger aperture, ultrashort pulsed lasers. Lastly, not all coating samples in the survey met the GDD requirements stated above and associated measurements are discussed in the context of the present and past competitions focused on similar broadband, near-IR MLD coatings.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Raluca A. Negres, Kyle R. P. Kafka, Chris Smith, Marek Stehlik, Sarah Olandt, Stavros G. Demos, and Amy Rigatti "Broadband, 920-nm mirror thin film damage competition", Proc. SPIE 12726, Laser-Induced Damage in Optical Materials 2023, 1272606 (24 November 2023); https://doi.org/10.1117/12.2685127

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KEYWORDS

Coating

Mirrors

Thin films

Deposition processes

Pulsed laser operation

Resistance

Ultrafast phenomena

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