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Optical lens coating

2021-06-07 17:55:54

Optical coating has become an indispensable process for most optical products. The film uses interference light's transmittance, waveband, refractive index and other parameters to correct the natural deficiencies caused by the optical product's own material.

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The application of coating ranges from daily glasses, mobile phone cameras, home appliances, to professional camera lenses, instrument lenses, and some anti-counterfeiting technologies. Modern optoelectronics, communications, laser and other technologies are also based on optical coating technology to develop to a level.

What to do optical coating processing?

In fact, optical coating processing can be roughly divided into functional coatings and protective coatings. Functional coatings, as the name suggests, are to meet the functional requirements of optical system imaging. The simplest functional coatings increase the light transmittance of optical lenses. We know that It is a basic requirement to obtain good imaging quality and ensure that as much light reaches the imaging photosensitive element as possible. Then the protective coating refers to the coating and grinding system designed to protect the glass lens from other infringements, such as anti-friction film, waterproof film and so on.

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The purpose of coating the surface of optical parts is to reduce or increase light reflection, beam splitting, color separation, light filtering, polarization and other requirements. Commonly used coating methods include vacuum coating (a type of physical coating) and chemical coating. Coating is to coat a transparent electrolyte film or a metal film on the surface of the material by physical or chemical methods. The purpose is to change the reflection and transmission characteristics of the material surface.

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Whether for CO2 lasers, copper, molybdenum, silicon, germanium, etc. are used to make mirrors, germanium, gallium arsenide, and zinc selenide are used as output windows and transmission optical component materials, or ordinary optical glass is used as mirrors for YAG lasers , Output mirror and transmission optical element materials, can not meet the requirements of more than 99% of the total reflection mirror. The output mirror has different transmittance requirements in different applications, so optical coating methods must be adopted.