2021-08-26
Optical Glass is Glass material used in the manufacture of lenses, prisms, mirrors, Windows, etc. of optical instruments or mechanical systems. Including colorless optical glass (usually referred to as optical glass), colored optical glass, radiation resistant optical glass, radiation resistant glass and optical quartz glass.
Optical glass has high transparency, high uniformity in chemistry and physics (structure and performance), and has specific and precise optical constants.
It can be divided into silicate, borate, phosphate, fluoride and chalcogenide series. There are many varieties, classified mainly by their position in the refractive index (nD) -Abbe (VD) diagram. Traditionally nD> 1.60 VD> 50 and nD< 1.60 VD> 55 of the various types of glass as crown (K) glass, the rest of the various types of glass as flint (F) glass.
Crown glass is usually used as a convex lens and flint glass as a concave lens. Usually the crown glass belongs to the alkaline borosilicate system, the light crown glass belongs to the aluminum silicate system, the heavy crown glass and barium flint glass belong to the alkali free borosilicate system, and most of the flint glass belongs to the lead potassium silicate system. With the continuous broadening of the application field of optical glass, its variety is expanding, its composition almost includes all the elements in the periodic table.
An inorganic glassy material that transmits light by refraction, reflection, or transmission or that changes the intensity or spectral distribution of light by absorption. It has stable optical properties and high optical uniformity.
It has special requirement for optical constant, high transmittance in visible region, no selective absorption coloring and so on.
The number is divided into corona glass and flint glass, and each type is divided into several kinds according to the refractive index, and the refractive index is arranged in order. It is mainly used as lens, prism, reflector of telescope, microscope, camera, etc.
High energy radiation has a large absorption capacity, high lead glass and CAO-B2O2 system glass, the former can prevent γ ray and X-ray radiation, the latter can absorb slow neutron and thermal neutron, mainly used in the nuclear industry, medical field as shielding and peeping window material.