Is there anything to pay attention to in optical coating processing of pvd coating machine? When light enters into different transmission materials (such as glass from air), about 5% will be reflected off. There are many lenses and refractors in the optical collimator, which together can cause 30% to 40% of the incident light loss. Modern optical lenses are usually coated with single-layer or multilayer antireflection coatings of magnesium fluoride. The single-layer antireflection coatings can reduce the reflection to 1.5%, and the multilayer antireflection coatings can reduce the reflection to 0.25%. Therefore, if the entire collimator is properly coated, the light penetration rate can reach 95%. The lenses coated with single layer antireflective film are usually blue purple or red, while those coated with multilayer antireflective film are light green or dark purple.

The essence of the antireflection coating of pvd coating machine to increase the transmitted light intensity is that the light wave, as an electromagnetic wave, changes its energy distribution at the interface of different media due to different boundary conditions during its propagation. For single layer films, when the media on both sides of the antireflection film are different, the film thickness is an odd number of times of 1/4 wavelength, and the refractive index of the film is n=(n1 * n2) ^ (1/2) (the refractive index of media 1 and 2 respectively), then the incident light can be fully transmitted through the media. Ordinary optical lenses are used in air. For ordinary optical glass with a refractive index of about 1.5, in order to achieve 100% antireflection effect of the single layer film, n1=1.23, or close to 1.23; The thickness of the antireflection film=(2k+1) times a quarter wavelength. Single layer films can only antireflect electromagnetic waves of a specific wavelength. In order to achieve antireflection in a wider range and at more wavelengths, people use multilayer films to achieve it.
People have a lot of experience in the use of antireflection membranes, and found many materials that can be used as antireflection membranes; At the same time, he has also mastered many advanced coating technologies, so the application of antireflection coatings involves medicine, military, space exploration and other industries, making significant contributions to human scientific and technological progress.