搜索

News information

了解较新的资讯与动态

新  闻  动  态

 NEWS

Optical Coating
来源: | 作者:prod209e7 | 发布时间: 2017-05-27 | 1033 次浏览 | 分享到:


Optical coating is composed of thin film layers, which can produce interference effect to change the transmission or reflection performance of the optical system. The properties of optical coating depend on the number of layers, the thickness of each layer and the refractive index between different layers. The common coating types in precision optics include anti-reflection film (AR), high reflection film (mirror), spectroscope film and filter film (short-wave pass, long-wave pass, notch wave, etc.). Anti-reflection film is suitable for most refracting optical parts, which can increase the luminous flux and reduce unnecessary reflection. High reflection film can provide maximum reflection in a single wavelength or a certain wavelength range. The film is used to separate incident light into transmitted light and reflected light. The filter coating is suitable for a wide range of life science and medical applications and can transmit, reflect, absorb or attenuate light at specific wavelengths. Aitmont optics can also provide a variety of custom coating to meet your application needs.
Optical coating is usually applied to specific incident angles and specific polarized light, such as S polarization, P polarization, or random polarization. If the Angle of light entering the coating is different from its designed Angle of incidence, the performance will be significantly reduced. If the Angle of incidence is very different from the designed Angle of incidence, the function of the coating may be completely lost. Similarly, using polarized light that is different from the one designed to produce the wrong results.
Optical coatings are made from deposited dielectric and metallic materials, such as tantalum pentaoxide (Ta2O5) and/or alumina (Al2O3) in alternating film layers. In order to maximize or minimize the interference in the application, the coating is usually of a quarter wavelength optical thickness (QWOT) or half wave optical thickness (HWOT). These films are made by alternating layers of high and low refractive indices, inducing an interference effect.