A number of aspects associated with the synthesis of high-purity compounds used in the gas-phase and sol-gel methods for preparing coatings and finely dispersed powders of oxides and oxide composites are considered.
The possibilities of evaluating the quality of the surface working of optical glass during grinding and polishing are investigated.The quality of optical components and joined surfaces is determined by, first and foremost, surface working processes. Basic factors appear here: the surface roughness of an optical component, which, when a coating is deposited, results in the appearance of thickness fluctuations of the layer and scattering of radiation; a substantial thickness of the layer destroyed by the working process on the substrate surface gives rise to fluctuations of the electric relief, which affects sorption processes, which are determining for obtaining films; in consequence, the appearance of fluctuations of the electric relief degrades the structure of the layers of the coating and the structural layer and results in fluctuations of the thickness of the growing layers; inadequate cleaning of the surface before deposition of a coating and the presence on the substrate surface of adsorbed foreign materials (contamination of the surface) likewise degrades the structure of the growing layers and results in thickness fluctuations of the layers. In addition, the presence of contamination on the substrate surface decreases coating stability with respect to operational factors.We shall examine the possibility of evaluating the quality of the working of a substrate surface, since this is the determining factor in obtaining coatings with prescribed optical and operational properties which remain stable during operation in optical devices. First and foremost, this concerns dielectric mirrors which have the highest possible reflection coefficient and satisfy the requirement of minimal losses to scattering.To obtain high-quality coatings that satisfy stringent operational requirements the main requirement is to have good optical surfaces with strictly prescribed properties with respect to shape and roughness.
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