By WDQ OPTICS | 06 January 2023 | 0 Comments
How to judge whether the optical glass is good?
How to judge whether the optical glass is good?
Optical glass refers to glass that can modify the direction of light transmission 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 an integral part of the optical system, it needs the request of optical imaging. Therefore, the quality of optical glass also contains some stricter indicators.
1、 Specific optical constants and the similarity of optical constants of the same batch of glass
Varieties of optical glasses have regular normalized refractive index values for different wavelengths of light, which serve as the basis for optical planners to plan optical systems. Therefore, the optical constants of optical glass produced by the factory need to be within the allowable error range of these values, otherwise, the actual imaging quality will be inconsistent with the expected results in the planning and the quality of optical instruments will be affected.
2、 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 the light passes through a series of prisms and lenses, some of its energy is lost by the interface reflection of optical parts, and the other is absorbed by the medium (glass) itself. Therefore, for the optical system containing multiple thin lenses, the main way to increase the transmittance is to reduce the reflection loss of the lens surface, such as coating the external antireflective film.
Optical glass refers to glass that can modify the direction of light transmission 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 an integral part of the optical system, it needs the request of optical imaging. Therefore, the quality of optical glass also contains some stricter indicators.
1、 Specific optical constants and the similarity of optical constants of the same batch of glass
Varieties of optical glasses have regular normalized refractive index values for different wavelengths of light, which serve as the basis for optical planners to plan optical systems. Therefore, the optical constants of optical glass produced by the factory need to be within the allowable error range of these values, otherwise, the actual imaging quality will be inconsistent with the expected results in the planning and the quality of optical instruments will be affected.
2、 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 the light passes through a series of prisms and lenses, some of its energy is lost by the interface reflection of optical parts, and the other is absorbed by the medium (glass) itself. Therefore, for the optical system containing multiple thin lenses, the main way to increase the transmittance is to reduce the reflection loss of the lens surface, such as coating the external antireflective film.
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