Applications Notes

Home Service Center Applications Notes

Optical coating

Views : 204
Time : 2018-03-14

The optical coating consists of a combination of thin film layers that create interference effects that alter the transmission or reflection properties of the optical system. The properties of the optical coating depend on the number of layers, the thickness of each layer, and the refractive index between the different layers. The types of coatings commonly used in precision optics include AR coatings, high-reflection (mirror) coatings, spectroscopes, and filter films (short-wave, long-wave, trap, etc.). The AR coating is suitable for most refractive optics. It can increase the luminous flux and reduce unnecessary reflections. High-reflection films can provide maximum reflection at a single wavelength or a range of wavelengths, mostly for mirrors. The splitter film is used to split the incident light into transmitted light and reflected light output. Filter coatings are suitable for a wide range of life science and medical applications and can transmit, reflect, absorb or attenuate light at specific wavelengths. Edmund Optics also offers a variety of custom coatings to meet your application needs.

Optical coatings are generally suitable for specific incident angles and specific polarized light, such as S-polarized, P-polarized, or random polarized. If the angle of the light incident on the coating is different from the designed incident angle, the performance will be significantly reduced. If the incident angle is greatly deviated from the design incident angle, the coating function may be completely lost. Similarly, using polarized light that is different from designing polarized light can produce erroneous results.

Optical coatings are made of deposited dielectrics and metallic materials such as tantalum pentoxide (Ta2O5) and/or alumina (Al2O3) in alternating thin film layers. To maximize or minimize interference in applications, coatings typically have quarter-wavelength optical thickness (QWOT) or half-wave optical thickness (HWOT). These thin films are alternately made of high refractive index and low refractive index layers to induce interference effects. See Figure 1 for an example broadband anti-reflection coating design.

Share :

Applications Notes

Business Introduction

Golden Way Scientific Co., Ltd. (registered in 1998) is a private company that focuses on the development of high-tech optical products and combines production and trade.


Since its establishment, the company has been devoted to the sales of optical precision instruments, as well as the design, development and processing of optical components, mechanical parts and optical lenses.


At present, the company has three optical components and mechanical parts manufacturing plants, an optical coating center, an optical inspection center, and an optical assembly room, located in Kunming, Jinzhou, Changchun, and Beijing.

Technical Manuals

Experiment Show

New Product Launch

Online Message

The public


Focus on the official public number.

Contact Us

@Copyright 2012. Beijing Golden Way Scientific Co., Ltd. All Rights Reserved