Moisture absorption characteristics of a SiO2 film from 2 to 3 μm
Yun Cui*, Hao Li, Kui Yi, and Jianda Shao
- Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
We prepare coatings on different substrates by either electron-beam evaporation or dual ion-beam sputtering. The relative transmittances of the coatings are measured during the heating process. The coating microstructures are studied. Results indicate that the intensity and peak position of moisture absorption are closely related to the microstructures of the coatings. The formation of microstructures depends not only on the preparation process of the coatings but also on the substrate characteristics.