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Why must Optical Glass Lenses have a High Degree of Transparency?

May. 08, 2020

As an Optical Windows Supplier, share with you. The difference between optical glass and other glasses is that as an integral part of the optical system, it must meet the requirements of optical imaging. Therefore, the determination of the quality of optical glass also includes some special and stricter indicators.

Optical Glass Lenses

Optical Glass Lenses

Today we will talk about the importance of optical glass having a high degree of transparency.

The brightness of the imaging of the optical system is proportional to the transparency of the glass. The transparency of optical glass to light of a certain wavelength is expressed by the light absorption coefficient Kλ. After the light passes through a series of prisms and lenses, part of its energy is lost at the interface reflection of the optical parts and the other part is absorbed by the medium (glass) itself. The former increases with the refractive index of the glass. This value is very large for high refractive index glass, such as about 6% of the light reflection loss of a surface of heavy flint glass. Therefore, for an optical system including multiple thin lenses, the main way to improve the transmittance is to reduce the reflection loss on the lens surface, such as coating the surface antireflection coating. For large-size optical parts, such as the objective lens of an astronomical telescope, due to its large thickness, the transmittance of the optical system mainly depends on the light absorption coefficient of the glass itself. By improving the purity of the glass raw material and preventing any coloring impurities from being mixed in the whole process from batching to smelting, the optical absorption coefficient of the optical glass can generally be less than 0.01 (that is, the glass with a thickness of 1 cm has a light transmission rate greater than 99% ).

Optical Glass Lenses is a high-precision optical component processing technology. It is to put softened optical glass into a high-precision mold and directly mold it at a time under the conditions of heating, pressure and oxygen-free Optical parts that meet the requirements for use. This technology has now become one of the most advanced optical parts manufacturing technology methods in the world. Since this technology can directly press and mold precision aspheric optical glass parts, it has created a wide range of optical instruments that can use aspheric glass optical parts. era. Therefore, it also brings new changes and developments to the optical system design of optoelectronic instruments, which not only reduces the volume of optical instruments, reduces weight, saves materials, reduces the workload of coating and assembly of optical parts, and reduces costs , And also improve the performance of optical instruments and improve the quality of optical imaging.

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