By WDQ OPTICS | 17 November 2022 | 0 Comments
What requirements should optical glass meet to be considered qualified？
What requirements should optical glass meet to be considered qualified？
There are many kinds of glass, including optical glass, which can change the direction of light transmission. It is widely used in lenses and prisms of optical instruments. Optical glass must meet the imaging requirements of light. It does not require higher quality optical glass than ordinary glass. Qualified optical glass shall meet the following requirements.
First of all, the optical constants of optical glass and the optical constants of the same batch of glass should be consistent. The first type of optical glass has a specified standard refractive index value for different wavelengths of light, which is the basis for optical designers to design optical systems.
Therefore, the optical constants of the optical glass produced by the factory must be within a certain allowable deviation range of these values, otherwise the actual imaging quality will be inconsistent with the expected results in the design and the quality of the optical instrument will be affected. At the same time, because the same batch of instruments are often made of the same batch of optical glass, in order to facilitate the unified calibration of the instruments, the allowable deviation of the refractive index of the same batch of glasses is more strict than their deviation from the standard value.
Secondly, it needs a high degree of transparency. The brightness of the optical system image is proportional to the transparency of the glass. The transparency of optical glass to light of a certain wavelength is determined by the light absorption coefficient K λ express. After light passes through a series of prisms and lenses, part of its energy is lost by reflection at the interface of the optical component, while the other part is absorbed by the medium (glass) itself. The former increases with the increase of glass refractive index, which is very large for high refractive index glass. For example, for heavy flint glass, the reflection loss of a surface light is about 6%.
There are many kinds of glass, including optical glass, which can change the direction of light transmission. It is widely used in lenses and prisms of optical instruments. Optical glass must meet the imaging requirements of light. It does not require higher quality optical glass than ordinary glass. Qualified optical glass shall meet the following requirements.
First of all, the optical constants of optical glass and the optical constants of the same batch of glass should be consistent. The first type of optical glass has a specified standard refractive index value for different wavelengths of light, which is the basis for optical designers to design optical systems.
Therefore, the optical constants of the optical glass produced by the factory must be within a certain allowable deviation range of these values, otherwise the actual imaging quality will be inconsistent with the expected results in the design and the quality of the optical instrument will be affected. At the same time, because the same batch of instruments are often made of the same batch of optical glass, in order to facilitate the unified calibration of the instruments, the allowable deviation of the refractive index of the same batch of glasses is more strict than their deviation from the standard value.
Secondly, it needs a high degree of transparency. The brightness of the optical system image is proportional to the transparency of the glass. The transparency of optical glass to light of a certain wavelength is determined by the light absorption coefficient K λ express. After light passes through a series of prisms and lenses, part of its energy is lost by reflection at the interface of the optical component, while the other part is absorbed by the medium (glass) itself. The former increases with the increase of glass refractive index, which is very large for high refractive index glass. For example, for heavy flint glass, the reflection loss of a surface light is about 6%.
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