Due to polished surface of some crystal and glass material tends to water absorbing and being scratched, it needs to be protective coated on this polished surface which we call it as “ protective coating”.
Such as Single layer MgF2、SiO2、AL2O3，etc..
Usually use single surface polished substrate or wedged substrate to measure Reflectivity.
（1）SAR（Single layer Anti-Reflective）
(SAR: Coat a layer of material on the substrate which refractive index is higher than coating material in order to lessen the substrate reflection,such as MgF2 or SiO2.
（3）DAR（Dual wavelength Band Anti-Reflective）
(DAR: Substrate with this kind of coating usually has very low reflectivity on two wavelength.
（4）WAR（Wideband AR ）
(WAR coating has low reflectivity between a wide wavelength range)
(Spectrum curve for some special coating is unique such as AR coating for three wavelength or super wide wavelength band)
(PR Coating means wavelength in a designed range are with same reflectivity)
（HR coating means wavelength in a designed range are all with high reflectivity which usually R>90%）
（1）FBS（Beam Splitter Plate）
Beam splitter coating on the plate can make the transmitted wavelength and reflected wavelength to be splitted in scale.
（2）CBS（Beam Splitter Cube）
(Beamsplitter coating on the hypotenuse surface of right angle prism can make the transmitted wavelength and reflected wavelength to be splitted in scale.)
（3）PBS-BPS（Polarization Beam Splitter Cube--- Broadband Polarization Beam Splitter Cube）
PBS coating on he hypotenuse surface of right angle prism can make the P-Polarized wavelength transmitted in higher ration and S-polarized wavelength to be highly reflected.)
（4） NPBS（Non-Polarization Beam Splitter）
Non-Polarization beam splitter coating achieves smaller polarization for transmission and reflection in specific wavelength range.
5、 Cut-off Filter
（1）SPF（Short-wave Pass Filter）
Short-wave Pass Filter has the beam-splitting performance of high transmission for short wave and cutting–off for long wave.
（2）LPF（Long-wave Pass Filter）
Long-wave Pass Filter has the beam-splitting performance of high transmission for long wave and cutting–off for short wave.
6、Narrow Band Filter
It achieves high transmission in specific narrow wavelength range and highly cut-off in near wavelength range.
It achieves highly cut-off in specific narrow wavelength range and high transmission in near wavelength range.
8、 Metal Coating
（1）Aluminum protective coating
Coating a layer of protective surface after aluminum coating
（2）Enhanced Aluminum coating
In order to achieve a higher reflectivity of the aluminum film, several pairs of dielectric films are coated on the surface of the aluminum film to achieve a higher reflectivity of the desired wave band.
（3）Metal induced filter
Metal-induced transmission filters have better and wider cut-off depth and width than general narrowband filters
Such as: T> 70% @ 558nm T <1% @ 528 & 598nm
（4）Neutral density filter
Specific band, filter the attenuation of light, show the neutral color overall, do not change the color
Such as: T = 20 ± 2.5%, @ 400 - 700nm
9, depolarization beam splitting film
Has a spectral characteristic, while the polarized light does not change a lot
Such as: Ang 45deg, Tp & Ts = 50% ± 5%, @ 400-700nm
10, transparent conductive film (ITO)
The window satisfies the high light transmission performance while the surface has electrical conductivity
Such as: T ≥ 85%, @ 400 ~ 700nm; surface resistance ≤ 40Ω / cm2
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