What is Optical Filter Glass?

Optical filter glass is a glass which can change the direction of light transmission and alter the relative spectral dispersion of ultraviolet, visible, or infrared light. Optical glass can be used to make optical instruments in the lens, prism, speculum and etc. The difference of optical glass and other glass is that it is a part of an optical system that requires optical imaging. As a result, the quality of optical glass also contains some of the more stringent indicators.

First, the specific optical constant and the consistency of the same batch of glass

Variety optical glass has regular standard refractive index values for different wavelengths of light, which is the basis for producers to plan optical systems. Therefore, the optical constant of the factory-produced optical glass needs to be within these acceptable error ranges, otherwise the result will out of the expectation of the practice of the image quality.

Secondly, the transmittance

The brightness of the optical system image is proportional to the transparency of the glass. Optical glass is expressed as a light absorption factor, Kλ After a series of prisms and lenses, the light’s energy is somewhat lost on the interface reflection of the optical part, while the other is absorbed by the medium (glass) itself. Therefore, the optical system containing multiple thin lenses, the only way to increase the pass rate lies in reducing the reflection loss of the lens exterior, such as applying the outer permeable membrane layer.

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