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2 December 2022 Mid-IR femtosecond laser induced damage precursor on multi-layer dielectric mirrors and gratings
Simin Zhang, Michael V. Tripepi, Brendan A. Reagan, Emily Sistrunk Link, Hoang T. Nguyen, David A. Alessi, Enam A. Chowdhury
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Proceedings Volume PC12300, Laser-Induced Damage in Optical Materials 2022; PC123000R (2022) https://doi.org/10.1117/12.2641646
Event: SPIE Laser Damage, 2022, Rochester, New York, United States
Abstract
The high-average-power petawatt-class Big Aperture Thulium (BAT) laser concept was proposed to meet the requirements for the next-generation compact particle accelerators. Our previous work reported the laser damage test and modeling of pulse compression gratings designed for the BAT laser and operating at 2 micron wavelength. Notably, we observed blister formation of the underlying layers at low fluences and ablation of the grating pillars at higher fluences. Here we present the measurement and analysis of these bulging damage precursors on the MLD gratings and mirrors using the cross-sectional transmission electron microscopy combined with focused ion beam processing.
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Simin Zhang, Michael V. Tripepi, Brendan A. Reagan, Emily Sistrunk Link, Hoang T. Nguyen, David A. Alessi, and Enam A. Chowdhury "Mid-IR femtosecond laser induced damage precursor on multi-layer dielectric mirrors and gratings", Proc. SPIE PC12300, Laser-Induced Damage in Optical Materials 2022, PC123000R (2 December 2022); https://doi.org/10.1117/12.2641646
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KEYWORDS
Femtosecond phenomena
Mid-IR
Dielectric mirrors
Dielectrics
Laser ablation
Laser applications
Laser optics
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