Laser-induced damage of dielectric-enhanced surface-modified single-point-diamond-turned Al-6061 multiband mirrors

Jue Wang; Leonard Wamboldt; Ronald W. Davis; Ying Shi; Todd L. Heck; Craig Ungaro; A. Boh Ruffin; Michael D. Thomas

doi:10.1117/12.2685665

24 November 2023 Laser-induced damage of dielectric-enhanced surface-modified single-point-diamond-turned Al-6061 multiband mirrors

Jue Wang, Leonard Wamboldt, Ronald W. Davis, Ying Shi, Todd L. Heck, Craig Ungaro, A. Boh Ruffin, Michael D. Thomas

Author Affiliations +

Proceedings Volume 12726, Laser-Induced Damage in Optical Materials 2023; 1272608 (2023) https://doi.org/10.1117/12.2685665
Event: SPIE Laser Damage, 2023, Dublin/Livermore, California, United States

Abstract

Laser-induced damage threshold (LIDT) tests were performed at 1064 nm and 20 ns. Nodule defects were identified as the LIDT-limiting factor. The results suggest that the scale of the nodules is associated with the size of defects residing on the aluminum substrate surface. 3D finite-difference time-domain (FDTD) simulation was employed to calculate the electric field intensity (EFI) enhancement at the nodular defects with a seed diameter ranging from 0.35 μm to 2.5 μm. A direct linkage between the EFI enhancement and laser-induced damage morphology was established. Additional LIDT tests were conducted on surface modified aluminum substrate by using Corning aluminum process (CAP). The surface modification led to a 10x increase of the LIDT. Finally, LIDT of the multiband mirrors was predicted based on the absorption-driven damage and defect-driven damage. The results suggested that a combination of the CAP-modified Al6061 and low defect deposition process of the dielectric enhanced layers lead to high laser durability.

Conference Presentation

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

Citation Download Citation

Jue Wang, Leonard Wamboldt, Ronald W. Davis, Ying Shi, Todd L. Heck, Craig Ungaro, A. Boh Ruffin, and Michael D. Thomas "Laser-induced damage of dielectric-enhanced surface-modified single-point-diamond-turned Al-6061 multiband mirrors", Proc. SPIE 12726, Laser-Induced Damage in Optical Materials 2023, 1272608 (24 November 2023); https://doi.org/10.1117/12.2685665

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