Laser-induced damage and contamination testing for the next generation of LIDAR space optics

Nils Bartels; Paul Allenspacher; Thimotheus Alig; Istvan Balasa; Helmut Schröder; Gabriele Taube; Wolfgang Riede

doi:10.1117/12.2600036

11 June 2021 Laser-induced damage and contamination testing for the next generation of LIDAR space optics

Nils Bartels, Paul Allenspacher, Thimotheus Alig, Istvan Balasa, Helmut Schröder, Gabriele Taube, Wolfgang Riede

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Proceedings Volume 11852, International Conference on Space Optics — ICSO 2020; 1185260 (2021) https://doi.org/10.1117/12.2600036
Event: International Conference on Space Optics — ICSO 2021, 2021, Online Only

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Abstract

We have recently reported a method to improve the laser-induced damage threshold of UV laser optics by mitigating damage precursors (nano-sized absorbers) during the manufacturing of ion-beam sputtered, anti-reflective optical coatings. To further optimize parameters of the coating and particle mitigation schemes, we had to assess the damage resistance of laser optics with a low density of damage precursors. This was achieved using large area raster scans in which a highintensity laser beam was scanned over the optical surface. Via image processing of microscopic data, we then derived the density and size distribution of laser-induced damages for each raster scan. This advanced test method is described in this work and prepared the path to the manufacturing of improved laser optics that can be used to increase the performance and reliability of lasers in future space missions. Furthermore, we report on the comparison of standard and improved laser optics in tests of laser-induced contamination at 355 and 266 nm.

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Nils Bartels, Paul Allenspacher, Thimotheus Alig, Istvan Balasa, Helmut Schröder, Gabriele Taube, and Wolfgang Riede "Laser-induced damage and contamination testing for the next generation of LIDAR space optics", Proc. SPIE 11852, International Conference on Space Optics — ICSO 2020, 1185260 (11 June 2021); https://doi.org/10.1117/12.2600036

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