Predicting laser damage from interference intensification by input surface mitigation cones

Isaac Bass; Eyal Feigenbaum; Allison Browar; James Vickers; Tristan Paton; Gabe Guss; Wren Carr

doi:10.1117/12.3032765

17 December 2024 Predicting laser damage from interference intensification by input surface mitigation cones

Isaac Bass, Eyal Feigenbaum, Allison Browar, James Vickers, Tristan Paton, Gabe Guss, Wren Carr

Author Affiliations +

Proceedings Volume 13190, Laser-Induced Damage in Optical Materials 2024; 131900E (2024) https://doi.org/10.1117/12.3032765
Event: SPIE Laser Damage, 2024, San Ramon, CA, United States

Abstract

Cones are machined into the surfaces of final fused silica NIF optics to remove laser induced damage. Applied to the input surface they are also to prevent the growth of exit surface damage by generating a shadow over the damage. As a result, cones with different sizes, depths, and shapes are being deployed in greater numbers. The expanding waves from input surface cones produce an intensification pattern at the exit surface from interference between the expanding annular wave from the cone walls and the incident beam. The probability of damage from this intensification will increase if two or more expanding waves overlap. The likelihood of overlap will increase with increasing use of these cones. It is impractical to survey all possible overlap situations through costly damage tests. We will explore alternative diagnostic and analytical tools to predict the probability of damage from the expanding waves of input cones with different degrees of overlap and at the higher NIF energies anticipated in the future.

Conference Presentation

Citation Download Citation

Isaac Bass, Eyal Feigenbaum, Allison Browar, James Vickers, Tristan Paton, Gabe Guss, and Wren Carr "Predicting laser damage from interference intensification by input surface mitigation cones", Proc. SPIE 13190, Laser-Induced Damage in Optical Materials 2024, 131900E (17 December 2024); https://doi.org/10.1117/12.3032765

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