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Optical glass is different from other glass

2015/11/19 view:

               The difference between optical glass and other glass is that it is a part of the optical system and must meet the requirements of optical imaging. Therefore, the determination of the quality of optical glass also includes some special and more stringent targets. The following requirements for optical glass: One, the specific optical constants and the consistency of the same batch of glass optical constants

                Each of the varieties of optical glass for different wavelengths of light has a specified standard refractive index, as the basis for the design of optical systems. Therefore, the optical constants of the optical glass in the factory must be within the limits of these values, otherwise it will make the actual image quality and design of the expected results do not conform to the quality of optical instruments. At the same time due to the same batch of equipment is often used in the same batch of optical glass manufacturing, in order to facilitate the unified calibration of the instrument, the refractive index of the same batch of glass to be more stringent than the deviation of the standard value.

                Two, a high degree of transparency of the optical system into a proportional relationship between the brightness and transparency of glass. The transparency of optical glass to a certain wavelength of light is represented by K. After a series of prism and lens, the light energy is absorbed by the interface of the optical part and the other part is the medium (glass). The former with glass refraction rate increases, the high refractive rate of glass this value is very large, such as the heavy flint glass surface optical reflection loss of about 6%. Therefore, the main way to improve the transmission rate of the optical system including a plurality of thin lens is to reduce the reflection loss of the lens surface, such as the coating surface coating, etc.. But for the large size optical components such as the telescope objective lens, because of its thickness, the transmittance of the optical system is mainly determined by the optical absorption coefficient of the glass itself. By improving the purity of the raw materials and preventing any colored impurities from the ingredients to the melting process, the light absorption coefficient of the glass is generally less than 0.01 (that is, the thickness is 1 cm.