Qualification of laser optics for high-power LIDAR space missions

Kurzfassung

Space environment presents unique challenges for the operation of optics and optical coatings as part of laser systems. This talk summarizes the test technology status for qualifying single component laser optics for space applications and lessons learned from these tests. Tests involve the measurement of laser-induced damage thresholds (LIDT) according to the S-on-1 test procedure detailed in ISO 21254-2 [1] as well as raster scans to test large surface areas. Another topic is the investigation of laser-induced molecular contamination (LIMC), which can degrade optical components and furthermore dramatically lower the LIDT. We recently developed an ISO technical report [2] describing the systematic measurement of LIMC. Methods to prevent and clean laser-induced deposits are also presented. Finally, the degradation of non-linear optical crystals due to ionizing radiation (space radiation) and methods for ground-based testing are discussed. [1] ISO 21254 (all parts), Lasers and laser-related equipment, Test methods for laser-induced damage threshold [2] ISO/TR 20811:2017(E), Optics and photonics, Lasers and laser-related equipment, Laser-induced molecular contamination