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4 March 2019 A change of paradigm for visual defects specification in high power lasers
F. Tournemenne, S. Bouillet, C. Rouyer, C. Leymarie, J. Iriondo, A. Baudier, B. Battelier
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Proceedings Volume 10898, High Power Lasers for Fusion Research V; 1089805 (2019) https://doi.org/10.1117/12.2509805
Event: SPIE LASE, 2019, San Francisco, California, United States
Abstract
Specification of visual defects (scratch and digs) on optics used in high-power laser facilities has always been a headache. Indeed, the wave degradation and the ensuing laser performances losses with regard to focal spot or downstream laser induced damage seem hard to predict. Indeed, one often has only partial information on each of the (often numerous) defects whereas the light behavior downstream strongly depends on the defect nature and morphology. So, determining general rules seem to be an impossible task. Borderline cases are then generally processed through timeconsuming optical profilometer measurements that are used in complex numerical laser propagation. We show in this paper that a simple analytic model can predict light intensification (responsible for some fratricide laser damage) with a high reliability. Defects are modeled by concentric quasi-circular rings of different radii, transmissions and phase shifts. The accuracy of these predictions will depend on the degree of knowledge of the model parameters set. In any case, upper bounds of intensifications can be provided as well as safe areas where intensification has decreased enough. These results allowed to specify defects dimensions and nature. We show good agreement between observed diffraction patterns downstream of real defects and model predictions, in terms of “hot spots” generation.
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F. Tournemenne, S. Bouillet, C. Rouyer, C. Leymarie, J. Iriondo, A. Baudier, and B. Battelier "A change of paradigm for visual defects specification in high power lasers", Proc. SPIE 10898, High Power Lasers for Fusion Research V, 1089805 (4 March 2019); https://doi.org/10.1117/12.2509805
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KEYWORDS
Optical components
Phase shifts
High power lasers
Laser induced damage
Diffraction
Laser beam propagation
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