Thermal stability of ultrafast laser-generated stress in fused silica

Carolyn C. Hokin; Brandon D. Chalifoux

doi:10.1117/12.2677504

28 September 2023 Thermal stability of ultrafast laser-generated stress in fused silica

Carolyn C. Hokin, Brandon D. Chalifoux

Proceedings Volume 12669, Optomechanical Engineering 2023; 126690M (2023) https://doi.org/10.1117/12.2677504
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

Ultrafast Laser Stress Figuring (ULSF) is a new process for shaping thin optics. The stability of ULSF generated stress, at room temperature and at elevated temperatures, is unknown. Exposing laser-figured samples to elevated temperature acts as a proxy for testing long-term stability of ultrafast laser-generated stress. We conducted an isochronal annealing study up to 500 °C, on fused silica wafers, figured with single-Zernike deformation components, measuring their shape after each cycle. We track changes in those deformations, demonstrating that figured samples show small amounts of relaxation under increasing temperature, beginning around 200-300 °C. This suggests ULSF produces stable mirror figuring only up to ~200 °C temperatures. Combined with previous measurements, this suggests ULSF may exhibit long-term stability at room-temperature.

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

Citation Download Citation

Carolyn C. Hokin and Brandon D. Chalifoux "Thermal stability of ultrafast laser-generated stress in fused silica", Proc. SPIE 12669, Optomechanical Engineering 2023, 126690M (28 September 2023); https://doi.org/10.1117/12.2677504

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