Refractive Index of Optical Glass

Mar. 27, 2020

Optical glass is different from ordinary glass. It is a high-quality glass that can be used to make optical lenses. It is also the main basic material of optical instruments, such as telescopes and fisheye lenses.

At present, the development of optical glass has been closely integrated with the development of optical instruments. It is inseparable. With the improvement of optical technology, optical glass has also been continuously put forward new requirements. What is the refractive index of optical glass? Hemisphere optical glass dome supplier introduces you:

Compared with ordinary glass, during production, optical glass is added with a small number of special materials, such as light-sensitive substances AgCl, AgBr, etc., and a small number of sensitizers such as copper oxide.

Adding small amounts of these substances can make this glass extremely sensitive to light. In addition, there are two other characteristics that optical glass must have, that is, an extremely accurate refractive index and an extremely high Abbe number. In addition, it requires extremely high transparency and uniformity. Here, I will give you some simple explanations on the refractive index of optical glass.

The refractive index of glass is the ratio of the speed of light in a vacuum to the speed of light in this type of glass. It is a characteristic of glass.

As a high-quality glass, each specific optical glass has a specific standard refractive index value for a certain wavelength of light. This is a necessary condition for optical glass because it is a different design for optical designers. The basic conditions of optical instruments, if the refractive index of optical glass does not meet the standard, the optical instruments manufactured by this optical glass will be biased once used, or the expected imaging effect cannot be achieved, which is absolutely intolerable in the research field.

Optical Glass

Optical Glass 

In the manufacture of optical instruments, the accuracy of the refractive index of optical glass has strict requirements, which requires that the refractive index error of the optical glass manufactured in the same batch is within a certain range. Of course, the smaller the error, the better. This facilitates the calibration of the instrument.

In the actual use of optical glass, there is another important index, that is, optical uniformity, which refers to the inconsistency of the refractive index of different points of the same light in the same glass. This is because in glass production, A phenomenon caused by inconsistent temperatures in different places in the annealing furnace during the process. When a beam of light passes through the glass with an uneven refractive index, the path of the light will show irregular changes, which will cause the optical glass step windows to display unsatisfactory imaging quality.

These are all the questions about the refractive index of optical glass.

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