How to Judge Whether the Optical Glass Is of High Quality?

 

        Optical glass refers to the glass that can change the transmission direction of light and the relative spectral dispersion of ultraviolet, visible or infrared light. Optical glass in a narrow sense refers to colorless optical glass; Optical glass can be used to make lenses, prisms, mirrors and windows in optical instruments. The difference between optical glass and other glasses is that as a component of an optical system, it must meet the requirements of optical imaging. Therefore, the determination of the quality of optical glass also contains some special and stricter indicators.


 

        I. consistency of specific optical constants and optical constants of the same batch of glass

Each type of optical glass has regular normalized refractive index values for different wavelengths of light, which is the basis for optical planners to plan optical systems. Therefore, the optical constant of the optical glass produced by the factory must be within the certain allowable error range of these values, otherwise, the actual image quality will be inconsistent with the expected results in the planning and the quality of the optical instrument will be affected.

        II. High transparency

The brightness of the optical system image is proportional to the transparency of the glass. The transparency of optical glass to a certain wavelength of light is expressed by the light absorption coefficient K λ express. After the light passes through a series of prisms and lenses, some of its energy is lost by the reflection of the interface of the optical parts, while the other is absorbed by the medium (glass) itself. Therefore, for an optical system including a plurality of thin lenses, the first way to improve the transmittance is to reduce the reflection loss of the lens surface, such as coating the surface antireflection film layer.


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