An ultralow refractive index is very advantageous when one designs antireflective coatings. We successfully obtained high-quality thin films with ultralow refractive indices from autoclaved sols prepared from magnesium acetate and hydrofluoric acid. The films consist of nanosized particles, and they have high laser-exposure durability at . The reflectance of the antireflective coating with five layers, of which the top layer is formed by our method, is lower than 0.6% in the incident angle range of at .
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