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24 November 2023 Ultrafast laser damage on SiO2/HfO2 multilayer dielectric mirrors reveals amorphous to crystalline phase transformation
Mohamed Yaseen Noor, Conrad Kuz, Gabriel Calderon, Aaron Davenport, Simin Zhang, Emma DeAngelis, Jinwoo Hwang, Carmen S. Menoni, Enam A. Chowdhury
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Proceedings Volume PC12726, Laser-Induced Damage in Optical Materials 2023; PC127260K (2023) https://doi.org/10.1117/12.2685130
Event: SPIE Laser Damage, 2023, Dublin/Livermore, California, United States
Abstract
Understanding the physical mechanism behind the laser-induced damage of multilayer dielectric interference coatings is essential for developing ultra-high intensity laser systems. The previous work reported high damage thresholds of MLD mirrors and blister formation near the threshold. Here, we present the cross-sectional study of the blisters using transmission electron microscopy and focused ion-beam processing. The measurement shows evidence of void formation and phase transformation under the surface, interdiffusion, and intermixing at the interfaces. These findings provide valuable insights into the mechanisms behind laser-induced damage, facilitating the development of more robust and reliable optics for high-power laser applications.
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(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Mohamed Yaseen Noor, Conrad Kuz, Gabriel Calderon, Aaron Davenport, Simin Zhang, Emma DeAngelis, Jinwoo Hwang, Carmen S. Menoni, and Enam A. Chowdhury "Ultrafast laser damage on SiO2/HfO2 multilayer dielectric mirrors reveals amorphous to crystalline phase transformation", Proc. SPIE PC12726, Laser-Induced Damage in Optical Materials 2023, PC127260K (24 November 2023); https://doi.org/10.1117/12.2685130
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KEYWORDS
Multilayers
Crystals
Dielectric mirrors
Laser crystals
Ultrafast lasers
Laser irradiation
Transmission electron microscopy
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