RU94044692A - Optical material - Google Patents

Abstract

FIELD: optics; particular, optical materials; applicable in optical systems possessing quality of presentation at theoretically limiting characteristics. SUBSTANCE: offered by the invention is optical highly refracting material in form of bismuth germanate BiGeOwhich possesses high refraction characteristics and relatively low dispersion and provides for improved quality of presentation. EFFECT: improved quality of picture at similar focal lengths due to correction of astigmatism owing to reduced curvature of refracting surface, increased service life of optical system due to the fact that the material is nonhygroscopic, monocrystalline and offered high radiation resistance, higher economic efficiency due to cut down cost of articles.

Claims (1)

The invention relates to optics, in particular to optical materials, and can be used in optical systems having improved image quality with theoretically extreme characteristics. In order to find a material with a high refractive index at a relatively low dispersion, which provides an increase in image quality, the use of bismuth orthogermanate Bi ₄ Ge ₃ O _{1 2} as an optical highly refractive material is proposed. The use of bismuth orthogermanate in the development of optical systems at the same focal lengths makes it possible to improve image quality by correcting astigmatism due to a decrease in the curvature of the refracting surface. The use of bismuth orthogermanate allows to increase the life of optical systems due to the non-hygroscopic nature of the material, its monocrystallinity, as well as high radiation resistance. In addition, the use of Bi ₄ Ge ₃ O _{1 2} as an optical material is economically advantageous, since with high image quality it can reduce the cost of products.