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 Optical components & Laser modulators

 

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Antireflection coatings

Antireflection coatings decrease reflection losses from the active surface of optical element. It means that they increase transmission of such optical elements as lenses, prisms or windows, which is very important for designs using more than a few components. Using antireflection coating becomes especially important in the case of optical elements made of material with high refraction index. Optical properties of antireflection coating depend on wavelength, angle of incidence and state of polarization.
Surface reflectance depends on the difference in refractive indices for air and glass (or other optical material).
Antireflection coatings consist of one or more dielectric layers. The kind of materials and thickness of layers used depend on the kind of substrate, wavelength range, properties of incident light and customer requirements.
Basically there are two kinds of antireflection coatings: one wavelength and broadband (multi-wavelength). The first one (also called “V”-type) is strongly optimized for one wavelength and recommended for laser optics. The very special item of this kind is two-wavelength coating (e.g. YAG 532/1064 nm).

three layers AR coating on N-BK7 glass three layers AR coating on N-BK7 glass
Single layer MgF2 coating on various glasses Single layer MgF2 coating on various glasses
V-type AR coating for 532nm V-type AR coating for 532nm
V-type AR coating for 1064nm V-type AR coating for 1064nm
V-type AR coating for 10,6 µm V-type AR coating for 10,6 µm
Double V-type AR coating for 532 nm and 1064nm Double V-type AR coating for 532 nm and 1064nm
Broadband basic AR coating for VIS Broadband basic AR coating for VIS
Very wide AR coating for VIS and NIR Very wide AR coating for VIS and NIR

Technical specifications

Antireflection coating
Wavelength/Substrate Typical rest reflection
Single-layer MgF2, UV, VIS or NIR optimized  
V-type AR coating (one wavelength optimized) 240 nm ÷ 450 nm on Quartz glass R < 0,25 %
450 nm ÷ 1200 nm on optical glass R < 0,2 %
900 nm ÷ 6000 nm on Si and Ge R < 0,3 %
10,6 µm on ZnSe R < 0,2 %
Double V-type AR coating(two wavelengths optimized) 400 nm & 800 nm R < 0,25 %
532 nm & 1064 nm R < 0,25 %
780 nm & 1064 nm R < 0,25 %
Broadband basic AR coating 300 nm ÷ 1500 nm on Quartz glass and optical glass with range λ1 - λ2 : λ2 =1,5 * λ1 (for example 440 nm ÷ 660 nm) R (aver.) < 0,4 %
Broadband wide AR coating 450 nm ÷ 1500 nm na szkle optycznym w zakresie λ1 - λ2 : λ2 =2 * λ1 (for example 450 nm ÷ 900 nm) R (aver.) < 0,5 %
Broadband very wide AR coating 450 nm ÷ 1500 nm on optical glass with range (500 nm ÷ 1000 nm) R (aver..) < 0,6 %
Broadband AR coating on Si 3,0 µm – 5,5 µm on Silicon R (aver.) < 1,5 %

 




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