Surface finishing by lacquer-coating technique

A series of optically flat glass substrates with microroughness of a few nanometers prepared by standard mechanical polishing has been covered with acrylic lacquer coatings. The influence of lacquer concentration on the surface finish has been investigated by using X-ray reflectometry and optical interferometry. The surface microroughness of about 0.6 nm with simultaneous preservation of the underlying optical figure may be achieved in the case of optimal lacquer concentration.