Antireflection coating materials types

The refractive indices of most glasses are too low for optimum efficiency of a single layer antireflection coating. If a more effective reduction in reflectance for various glass types is required, this can be achieved with a minimum of two films. Deposition of a high-index material on the substrate as a first film enables the use of magnesium fluoride as the second layer. Such systems have been studied by Catalan... 

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