What are the optical principles used in camera lens coating?

Optical coating

Principle of optical coating: interference of light is widely used in thin film optics. The common method of optical thin film technology is to coat a thin film on a glass substrate by means of vacuum sputtering, which is generally used to control the reflectivity and transmittance of the substrate to the incident light beam to meet different needs.

In order to eliminate reflection loss on the surface of optical parts and improve imaging quality, one or more transparent dielectric films are coated, called anti-reflection coating or anti-reflection coating. With the development of laser technology, there are different requirements for the reflectivity and transmittance of the coating layer, which has promoted the development of multi-layer high-reflective coatings and broadband anti-reflection coatings. For various application needs, high reflective films are used to manufacture polarizing reflective films, color spectroscopic films, luminescent films, interference filters, etc.

Extended information:

Optical thin films are realized in a high-vacuum coating chamber. Conventional coating processes require elevated substrate temperatures (usually about 300°C); while more advanced technologies, such as ion-assisted deposition (IAD), can be performed at room temperature. The IAD process not only produces films with better physical properties than conventional coating processes, but can also be applied to substrates made of plastic. The main vacuum system consists of two cryogenic pumps. The control modules for electron beam evaporation, IAD deposition, light control, heater control, vacuum control and automatic process control are all on the front panel of the coating machine.

Baidu Encyclopedia-Optical Coating