Kdp Crystal Components Hydrophobic Less Anti-chemical Films And Research

As the research and development of Inertial Confinement Fusion (ICF) which was widely used in energy and affairs of military, more and more concentration was focused on high-power lasers. Potassium dihydrogen phosphate (KDP) crystal is the frequency converter in ICF, which is easy to absorb the moisture in atmosphere when exposed in the air. The consequence is the loss in optical transmission and lower lifetime.Silica films were used widely as KDP crystal protective coatings. In this paper, a novel inorganic-organic hybrid hydrophobic anti-reflection silica film used for laser crystal was obtained by sol-gel process. The film consisted of silica sols mixed with a small amount of polymethyl methacrylate (PMMA) or polystyrene (PS). The optical transparency, hydrophobic property and surface morphology of the film were characterized by UV-VIS-NIR spectrophotometer; contact angle instrument and Scanning Electron Microscopy (SEM), respectively. The results showed that the anti-reflection coating had good hydrophobility and optical transparency from 400 nm to 1200 nm. The contact angle reached to 130-140°. SEM images indicated the hydrophobic films modified with PMMA or PS had compact structure compared to the pure silica sol film.