The coating technology used by the optical vacuum coating machine is generally known as optical coating. The common method of optical coating technology is to coat a thin film on a glass substrate by vacuum sputtering. Optical coating is usually used to control the reflectivity and transmission of the substrate to the incident beam. rate to meet different needs. In order to eliminate reflection losses on the surface of optical components and improve image quality, one or more layers of transparent dielectric films, known as antireflection films or antireflection films, are coated.

        With the development of laser technology, optical coatings have put forward different requirements for the reflectivity and transmittance of thin films, which has promoted the development of multi-layer high-reflection films and broadband anti-reflection films. For various application requirements, high reflection films are used to manufacture polarized reflection films, dichroic films, luminescent films, interference filters, etc.
         After coating the surface of an optical component, the optical coating reflects and transmits multiple times on the coating, resulting in multi-beam interference. Different intensity distributions can be obtained by controlling the refractive index and thickness of the coating. This is the basic principle of interference coating.
         The optical properties of optical vacuum coating machine coatings, such as refractive index, absorptivity, and laser damage threshold, mainly depend on the microstructure of the coating. Film material, residual gas pressure and substrate temperature can all affect the microstructure of the film. If the mobility of vapor-deposited atoms on the surface of the substrate is low, the coating will contain micropores. These pores are gradually filled with water vapor when the film is exposed to moist air. such as cylindrical mirrors.