The coating methods include vacuum coating and optical coating. What is the difference in principle between them?
The coating methods include vacuum coating and optical coating. What is the difference in principle between them? The following editor will give you a brief introduction.
1. Vacuum coating is an important aspect of the vacuum application field. It is based on vacuum technology, using physical or chemical methods, and absorbing a series of new technologies such as electron beam, molecular beam, ion beam, plasma beam, radio frequency and magnetron. , Provides a new process of thin film preparation for scientific research and actual production. Simply put, the metal, alloy or compound is evaporated or sputtered in a vacuum to make it on the coated object (called substrate, substrate or The method of solidification and deposition on the substrate).
2. Light interference 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 reflectance and transmittance of the substrate to the incident beam to meet different needs. In order to eliminate the reflection loss on the surface of optical parts and improve the image quality, one or more layers of transparent dielectric film are coated, which is called antireflection film or antireflection film.
With the development of laser technology, there are different requirements for the reflectance and transmittance of the coating, which promotes the development of multilayer high-reflection coatings and broadband antireflection coatings. For various application needs, use highly reflective films to make polarized reflective films, color splitter films, cold light films, interference filters, etc. After the surface of optical parts is coated, light is reflected and transmitted multiple times on the film layers to form multi-beam interference By controlling the refractive index and thickness of the film, different intensity distributions can be obtained. This is the basic principle of interference coating.