Siolica (Si) windows
  • Siolica (Si) windows

Siolica (Si) windows

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Silicon window has good thermal conductivity and low density, except as a slice of silicon window can also be made into silicon laser reflector, silicon lens, silicon flat convex lens, silicon double convex lens, silicon, silicon plane concave lens wedge Angle of window film, silicon films such as laser window, a variety of laser equipment and industrial applications, used in the infrared wavelengths of high precision instruments.

Silicon window plates are commonly used in the 1.2-8 muon near-infrared spectrum.



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Silicon window has good thermal conductivity and low density, except as a slice of silicon window can also be made into silicon laser reflector, silicon lens, silicon flat convex lens, silicon double convex lens, silicon, silicon plane concave lens wedge Angle of window film, silicon films such as laser window, a variety of laser equipment and industrial applications, used in the infrared wavelengths of high precision instruments.
Silicon window plates are commonly used in the 1.2-8 muon near-infrared spectrum.
Silicon substrate density is small, the density of germanium material or zinc selenide material half, the weight is relatively light, silicon optical elements than germanium hardness is higher, commonly used in 3-5um band applications or 3-5 muon coating after anti-reflection film.
Silicon (Si) single crystals are commonly used as substrates for medium wave infrared optical Windows and optical filters of 3 to 5 microns. Due to their good thermal conductivity and low density, they are also commonly used for making laser reflectors or infrared temperature measurement and infrared optical lenses.
Specification




  Commercial   GradePrecision GradeHigh Precision Grade
Dimension1mm-600mm
Dimension tolerance±0.1mm±0.025mm±0.01mm
Thickness tolerance±0.1mm±0.025mm±0.01mm
Parallelism<3 arc min<30 arc sec.<2 arc sec.
Surface quality60/4040/2020/10
Surface accuracyλλ/10λ/20
Coating3-5um OR
8-12um T>97%





Type No.Diameter
    (mm)
Thickness
    (mm)
        Coating
BRD-GW-10 X1101    AR   Coating@3-5um
    AR Coating@8-14um
    AR/DLC Coating@3-5um
    AR/DLC Coating@8-14um
BRD-GW-12.5X112.51
BRD-GW-20 X2202
BRD-GW-25X3253
BRD-GW-30X3303
BRD-GW-38.1X338.13
BRD-GW-40 X4404
BRD-GW-50 X3503
BRD-GW-50.8 X350.83
BRD-GW-63.5 X563.55
BRD-GW-75 X3753
BRD-GW-75 X5755
BRD-GW-76.2 X676.26
BRD-GW-80 X8808
BRD-GW-90X109010
BRD-GW-100 X1010010
BRD-GW-150 X1515015
BRD-GW-180 X1818018
BRD-GW-200 X2020020
BRD-GW-300 X3530035



Siolica (Si) windowsAs a kind of nonmetallic element, Silicon is broadly used in semiconductor and optics. In semiconductor, Si is usually grown by Czachralski method and Float-zone process. Generally, the resistivity of Si grown by Czachralsik method(< 10 ohm/cm) is lower than that by Float-zone process(>10 ohm/cm). Besides, it can also be classified into N type(with Phos doped) and P type (with Boron doped) according to the conductivity. In infrared optics, we commonly use Float-zone(FZ) silicon which is much pure for the purpose of better transmittance. It is the most economical element for optics compared to Ge and other infrared materials like ZnSe, ZnS, etc. From fig. 1, we can see that the transmittance is generally the same between 3-8 um and arrives at the bottom at 9 um. With AR coatings, the transmittance can reach 95% and higher from Fig 2.


Density (g/cm3)
2.33
Melting point (℃)
1420
Permittivity Static/high frame
13@19GHz
Coefficient of thermal expansion (1/℃)
4.15x10-6
Elastic Modulus (Gpa)
102
Shear modulus of elasticity (Gpa)
79.9
Coefficient of thermal conductivity (J/k.m.s)
163.3@273K
Specific heat capacity (J/g.k)
0.773
Knoop (Kg/mm2)
1150
Young's modulus (Gpa)
131
Poisson ratio
0.266
Elastic coefficient
C11=167 C11=65  C11=80
The range of transmission wavelength
1000nm-10000nm
30000nm-300000nm
The absorption coefficient (1/cm)
1.6 x 10--4
Thermo-optic coefficient
1.6  x 10-3@3000nm



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