Views: 1 Author: Site Editor Publish Time: 2017-10-04 Origin: Site
A glass material used to make lenses, prisms, mirrors, windows, etc. for optical instruments or mechanical systems. Including colorless optical glass (usually referred to as optical glass), colored optical glass, radiation-resistant optical glass, radiation glass and optical quartz glass. Optical glass has a high degree of transparency, chemical and physical (structure and performance) on the high degree of uniformity, with specific and accurate optical constants. It can be divided into silicate, borate, phosphate, fluoride and sulfur compounds series. The variety is mainly classified according to their position in the refractive index (nD) - Abbe number (VD). Traditionally, nD> 1.60, VD> 50 and nD55 various types of glass as the crown (K) glass, the rest of the glass as the flint (F) glass. Coronal glass is generally convex lens, flint glass for concave lens. Usually coronal glass belongs to the alkali borosilicate system, lightly corona glass belongs to the aluminosilicate system, the corona glass and the barium flint glass belong to the alkali-free borosilicate system, and most of the flint glass belongs to lead potassium silicate system. With the continuous expansion of the field of optical glass applications, its variety is constantly expanding its composition, including almost all the elements in the periodic table.
An inorganic glassy material that transmits light by refraction, reflection, transmission, or by absorbing the intensity or spectral distribution of light. Has a stable optical properties and a high degree of optical uniformity. In order to make the image transmitted by the optical system clear and not distorted, it is required that the glass has a high degree of uniformity and a specific and accurate optical constant. According to the optical characteristics are divided into: ① colorless optical glass. The optical constant has a specific requirement, with a high visible area, no choice to absorb coloring and so on. According to the size of the Abbe number is divided into the crown and flint glass, all kinds of high and low according to the refractive index is divided into several kinds, according to the size of the order of refraction. Used as a telescope, microscope, camera and other lenses, prisms, mirrors and so on. ② anti-radiation optical glass. There is a high absorption capacity for high-energy irradiation, with high lead glass and CaO-B2O2 system glass, which can prevent gamma rays and X-ray irradiation, which absorbs slow neutrons and thermal neutrons, mainly for nuclear industry , Medical field as shielding and peeking window material. ③ radiation-resistant optical glass. Under certain gamma rays and X-ray irradiation, the visible area has a small change in transmittance, and the variety and grade are the same as those of colorless optical glass, and are used to produce optical instruments and peep windows under high energy irradiation. ④ colored optical glass. Also known as filter glass. For UV, visible, infrared wavelengths specific wavelength selective absorption and permeability, according to spectral characteristics are divided into selective absorption, cut-off and neutral gray 3; according to the coloring mechanism is divided into ion coloring, metal colloid coloring and sulfur selenium Chemical coloring class 3, mainly used in the manufacture of filters. ⑤ UV and infrared optical glass. In the ultraviolet or infrared band has a specific optical constant and high transmittance, used as UV, infrared optical instruments or as a window material. ⑥ optical quartz glass. With silica as the main component, with high temperature, low expansion coefficient, high mechanical strength, good chemical properties, for the manufacture of various bands through the special requirements of the prism, lens, window and mirror. In addition, there are for the large-scale integrated circuit manufacturing photomask board, liquid crystal display panel, video disc plate plate glass; light along the magnetic field lines through the glass when the polarization plane rotation of the magneto-optic glass; light in a certain direction by transmission Ultrasonic glass, the occurrence of light diffraction, reflection, convergence or optical frequency shift of sound and light glass.