Classification of optical glass

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1. Colorless optical glass

There are specific requirements for optical constants, such as high visible light transmission and no selective absorption coloration. According to the size of Abbe number, it is divided into enamel and flint glass. The types are classified into several types according to the refractive index, and are arranged in order of refractive index. It is used as a lens, prism, mirror, etc. for telescopes, microscopes, cameras, etc.

2. anti-irradiation optical glass

High absorption of high energy radiation, high lead glass and CaO-B2O2 system glass, the former can prevent gamma rays and X-ray irradiation, the latter can absorb slow neutrons and thermal neutrons, mainly used in the nuclear industry , the medical field, etc. as a shielding and peep window material.

3. Irradiation resistant optical glass

Under certain gamma-ray and X-ray irradiation, the transmittance in the visible region changes less. The varieties and grades are the same as the colorless optical glass, and are used to manufacture optical instruments and peep windows under high-energy irradiation.

4. colored optical glass

Also known as filter glass. Selective absorption and transmission properties for specific wavelengths in the UV, visible, and infrared regions. Divided into selective absorption, cut-off, and neutral ash according to spectral characteristics; classified into ion coloring, metal colloid coloring, and sulfur selenium according to the coloring mechanism. The compound coloring class 3 is mainly used to manufacture filters.

5. UV and infrared optical glass

It has specific optical constants and high transmittance in the ultraviolet or infrared range and is used as an ultraviolet or infrared optical instrument or as a window material.

6. optical quartz glass

With silica as the main component, it has the characteristics of high temperature resistance, low expansion coefficient, high mechanical strength and good chemical properties. It is used to manufacture prisms, lenses, windows and mirrors with special requirements for various wavelengths. In addition, there are photomasks for large-scale integrated circuit manufacturing, liquid crystal display panels, and image-based disc-based thin-plate glass; magneto-optical glass in which the plane of polarization rotates when light passes through the glass in the direction of magnetic lines of force; light is transmitted in a certain direction. In the case of ultrasonic glass, acousto-optic glass in which light is diffracted, reflected, concentrated, or optically shifted occurs.

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