Laser coatings designed for space applications not only encounter harsh space environments, but also suffer from laser irradiation. High-energy radiation in space, such as Gamma rays, can cause defects and other damage to materials, which could contribute to laser damage induced by defect absorption. In this work, we studied the optical properties and structural composition of three groups of 1064 nm multilayer antireflection (AR) coatings irradiated by Gamma rays (345 Gy), and the effect of Gamma ray radiation on the laser-induced damage properties of thin films. Experimental results revealed that after exposure to Gamma ray, the absorption and surface roughness of the AR coating increased while the transmittance decreased. X-ray photoelectron spectroscopy (XPS) analysis confirmed that SiO₂ is more fragile under Gamma radiation compared to Ta₂O₅ and HfO₂. It was also demonstrated that the Gamma ray damage of AR coatings mainly occurred in the SiO₂ layers, and consist of generation of oxygen vacancies and charging defects. The defects generated by Gamma rays increased the absorption of the laser power by the film, hence increasing the probability of laser-induced damage and reducing the laser-induced damage threshold of the film. The coatings prepared by sputtering deposition technique showed lower probability of damage by Gamma ray radiation compared to electron-beam evaporated coatings.

专为太空应用设计的激光涂层不仅会遇到恶劣的太空环境，还会受到激光照射的影响。空间中的高能辐射，例如伽马射线，会对材料造成缺陷和其他损坏，这可能会导致缺陷吸收引起的激光损坏。在这项工作中，我们研究了伽马射线 (345 Gy) 辐照的三组 1064 nm 多层减反射 (AR) 涂层的光学性能和结构组成，以及伽马射线辐射对薄膜激光损伤性能的影响. 实验结果表明，在伽马射线照射后，增透膜的吸收率和表面粗糙度增加，而透射率降低。X 射线光电子能谱 (XPS) 分析证实 SiO ₂与Ta ₂ O ₅和HfO ₂相比，在伽马辐射下更脆弱。还表明增透膜的伽马射线损伤主要发生在SiO ₂层，包括氧空位的产生和充电缺陷。伽马射线产生的缺陷增加了薄膜对激光功率的吸收，从而增加了激光致损伤的概率，降低了薄膜的激光致损伤阈值。与电子束蒸发涂层相比，通过溅射沉积技术制备的涂层显示出较低的伽马射线辐射损坏概率。