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Optical film
 
Specification of optical products
(This product is customized or target development)
1.  Thin-film optical coating
1.1  Optical reflective film
1.2  Anti-reflection coating
1.3  Optical thin-film beam splitter
1.4  Optical filter
1.5  Depolarization film
2.  Photoelectric functional thin film
2.1  Near infrared transparent conductive film
2.2  Ultraviolet transparent conductive film
2.3  P-type transparent conductive film
 
1.  Thin-film optical coating
1.1  Optical reflective film
FeaturesThe function of reflective film is to increase the reflectance of optical surface. It can be divided into three categories, namely, metal reflective film, all dielectric reflective film and metal-dielectric reflective film. Among them, all dielectric reflective films can have characteristics of high reflection and low absorption in different spectral band.
Application: It can be used in the manufacture of light reflection, refraction and cavity devices, and has a wide range of application fields in laser, LED, optical instrument, and laser display, etc.
Products:We can provide narrow bandwidth (spectral range 6-20 nm), medium bandwidth (100-200 nm) and large bandwidth (300-500 nm) optical high reflective (HR) coatings.
Parameters of high reflective coating

Model
Name
Surface Precision
Diametermm)
Thickness (mm)
Incident Angle
Reflectance
HR400-780
Visible HR
λ/4
10-100
0.5-10
0°-57°
99.8%
HR780-2500
NIR HR
λ/4
10-100
0.5-10
0°-57°
99.8%

 
Fig. 1  All dielectric HR coating on K9 glass with a bandwidth between 1250-1610 nm, incident angle of 45°, and reflectance of 95%, and its transmittance spectrum.
Fig. 2  All dielectric HR coatings on K9 glass for lasers at the near infrared band of 1064 nm.
 
Fig. 3  All dielectric laser HR coatings with medium bandwidth.
 
Fig. 4  Reflectance spectra of all dielectric laser HR coatings with medium bandwidth.
 
Fig. 5  All dielectric laser HR coatings with large bandwidth.
Fig. 6  Reflectance spectrum of all dielectric laser HR coatings with large bandwidth.
 
 
1.2  Anti- reflection (AR) coating
Features:The main function of AR coatings is to reduce or eliminate reflective light on optical surface of lenses, prisms and plane mirrors, thereby increase the light transmittance of these components, reduce or eliminate stray light, and then minimise dazzling light and virtual image, so that the imaging quality of optical system can be improved greatly.
Application: Widely used in cameras, lasers and various optical system, and is the largest output of optical coatings.
Specification:We can design and manufacture all kinds of AR coatings for customers, including single wavelength, medium bandwidth (100-200 nm) and large bandwidth AR coatings.
 
1.3  Optical thin-film beam splitter
Features:Optical thin-film beam splitter can divide a beam of light into two parts according to certain requirements. There are three kinds of them that are dielectric, metal and polarizing beam splitters, respectively. The dielectric beam splitters are made by multilayer dielectric film, which is characterized by small absorption and efficient light separation. The disadvantage is that the polarization effect is obvious. Light polarizing beam splitter that can realize two beams of linear polarization light with the equal intensity is only applicable to natural light or circularly polarized light. This kind of polarizing beam splitter can compensate for the unadjustable shortcoming of polarization properties of optical crystals. Metal beam splitter can split light under a wide spectral range due to small polarization effect of metals, but has a disadvantage of large light absorption from metal films. However, it is possible to reduce light absorption by changing the surrounding media.
Application: Optical instrument, optical path system, optical fiber communication
Specification: Customized.
 
1.4  Optical filter
Features:Interference filter is a kind of optical thin film with complex structure, which can be divided into three kinds: cut-off filter, band-pass filter and induced transmission filter. Its main function is to split the spectral band. The interference cut-off filter requires a high transmission of light beam in a spectral band, and a high reflectance when deviated from the spectral band. When cut-off occurs in shortwave spectral region with a high transmission in longwave spectral region, the filter is called long-wavelength pass filter, and named as short-wavelength pass filter vice versa. Band pass filter refers to a high transmittance in a certain band, and high reflectance at the rest of the band.
Application: Color printings, color TVs and other color light-splitting elements; hot mirror and cold mirrors; high-power lighting sources; solar cells; optical fiber communication.
Specification: Customized.
 
1.5  Depolarization film
Features:All optical devices produce polarization effects when incident light is not perpendicular to it. Depolarization films can keep the proportion of P light and S light as far as possible in the incident beam after light splitting, and eliminate negative effects caused by the polarization effect.
Application: Interferometer, various imaging instruments
Specification: Customized.
 
 
 
2. Photoelectric functional thin film
2.1  Near infrared transparent conductive film
Features:Transparent conductive films with high conductivity and high transparency in wide spectral range (400-2500 nm) from visible to near infrared.
Application: Electromagnetic shield, infrared detector, infrared LED.
Specification: The average transmittance reaches 80% in the 400-2500 nm wavelength range. The surface resistance is 40-200 Ω/□.
 
Fig. 10  Sample photos and transmittance spectra
 
2.2  Ultraviolet transparent conductive film
Features:Transparent conductive films have high conductivity and high transparency in the near ultraviolet to visible spectral range (300-700 nm).
Application: UV detectors, UV LEDs, UV lasers.
Specification: The average transmittance is more than 80% in the 300-700 nm wavelength range. The surface resistance is 20-200 Ω/□.
 

Fig. 11  Sample photos and transmittance spectrum

 
2.3  P-type transparent conductive film
Features:Transparent conductive films, with hole as main carrier, have a certain conductivity and transparency.
Application: UV LEDs, UV lasers, transparent optoelectronic devices, transparent electrode for p-type semiconductor.  
Specification: The average transmittance is 50-80% in visible spectral range. The surface resistance is 100-5000 Ω/□.
Fig. 12  Sample photo of P-type transparent conductive film
 
High vacuum coating equipment
 
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