Optical glass refractive index, let you explore high-precision optical instruments

May. 27, 2019

Unlike ordinary glass, optical glass is a high-quality glass that can be used to make optical lenses. It is also the main basic material for optical instruments, such as telescopes and fisheye lenses. At present, the development of optical glass has been closely combined with the development of optical instruments, and it is inseparable. With the improvement of optical technology, optical glass is constantly being put forward new requirements. What is the refractive index of the optical glass?

Optical glass refractive index, let you explore high-precision optical instruments

Compared with general glass, optical glass is added with a small amount of special materials such as AgCl, AgBr, etc., which are sensitive to light, and a small amount of sensitizer such as copper oxide. The addition of small amounts of such materials can make such glasses exceptionally sensitive to light. In addition, there are two characteristics that must be possessed by optical glass, that is, the exceptionally accurate refractive index and the extremely high precision Abbe number. In addition, transparency and uniformity are extremely high. Here, let's make some simple explanations about the refractive index of optical glass.The refractive index of glass is the ratio of the speed at which light travels in a vacuum to the speed at which light travels through this type of glass. It is a property of glass.As a high-quality glass, each specific optical glass has a specified standard refractive index value for a certain wavelength of light, which is a necessary condition for optical glass, because it is designed by optical designers. The basic conditions of an optical instrument, if the refractive index of the optical glass does not reach the standard, the optical instrument manufactured by the optical glass may be deviated once used, or the expected imaging effect cannot be achieved, which is unacceptable in the research field. .In the manufacture of optical instruments, the accuracy of the refractive index of the optical glass has strict requirements, which requires that the refractive error of the optical glass produced by the same batch is within a certain range. Of course, the smaller the error, the better. This is good for instrument calibration.In the actual use of optical glass, there is also an important index, that is, optical uniformity, which refers to the inconsistency of the refractive index of the same light at different sites in the same glass, because it is produced in glass. In the process, a phenomenon caused by inconsistent temperatures in different places in the annealing furnace. When a beam of light passes through a piece of glass with an uneven refractive index, the path of the light changes irregularly, which in turn causes the optical instrument to exhibit an undesired image quality.

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