Vacuum coating machine and antireflection coating for glass and plastic
The antireflection coating on the glass and plastic substrates of the vacuum coating machine is a very important component in many optical systems. It is a coating that can reduce reflection on the lens. In many applications, AR coatings are indispensable. Otherwise, the application requirements cannot be met.
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Is there anything I should pay attention to in the optical coating process of the vacuum coating machine? When light enters different transfer materials (such as air into glass), about 5% will be reflected off, there are many lenses and refractors in the optical sight, the total can make the incident light loss up to 30% to 40% . Modern optical lenses are usually coated with a single-layer or multi-layer magnesium fluoride AR coating. A single-layer AR coating can reduce reflection to 1.5%, and a multilayer AR coating can reduce reflection to 0.25%, so the entire aim If the mirror is properly coated, the light penetration rate can reach 95%. Lenses coated with a single-layer AR coating are usually blue-violet or red, while lenses coated with a multi-layer AR coating are light green or dark purple.
The essence of increasing the transmitted light intensity of the antireflection coating of the vacuum coating machine is that the light wave as an electromagnetic wave changes its energy distribution on the interface of different media due to the different boundary conditions during the propagation process. For a single-layer film, when the media on both sides of the AR coating are different, the film thickness is an odd multiple of 1/4 wavelength and the refractive index of the film is n = (n1 * n2) ^ (1/2) (respectively medium 1 , 2 refractive index), so that all incident light can be transmitted through the medium. General optical lenses are used in air. For optical glass with a general refractive index of about 1.5, in order to achieve a 100% antireflection effect for a single film, n1 = 1.23, or close to 1.23; Thickness = (2k + 1) times one-quarter wavelength. The single-layer film only enhances the transmission of electromagnetic waves of a specific wavelength. In order to achieve the enhancement of transmission in a wider range and more wavelengths, people use multi-layer coating to achieve.
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People have a lot of experience in the use of AR coatings, and have found many materials that can be used as AR coatings; at the same time, they have mastered many advanced coating technologies, so the application of AR coatings involves medicine, military, space exploration, etc. All walks of life have made significant contributions to the progress of human science and technology.
Zunhua Baorui Titanium is dedicated to the development and production of vacuum coating machines, providing customers with customized process solutions and coating equipment. It specializes in the manufacture of various vacuum coating equipment and is a well-known vacuum coating manufacturer.