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Silicon Window

Silicon is used for windows and lenses in the 2-7µm range, ideal choice for IR LED lenses. The refractive index is near 3.4 throughout the range. Silicon high thermal conductivity and low weight are attractive features in IR or FTIR applications. Silicon is also used as a high reflectivity mirror for lasers and for IR silicon viewports.








Silicon windows specifications:


Standard precision

High-precision

Dimension Tolerance

φ5-250mm+0/-0.2

φ3-350mm+0/-0.2

Thickness Tolerance

1-50mm+/-0.1

1-50mm

Parallelism

1 arc minute

10 arc seconds

Surface Quality

60/40

20/10

Flatness

N<λ/2@633nm(at 50mm)

N<λ/10@633nm(at 50mm)

Clear Aperture

>90%

>95%

Chamfer

Protected <0.5mmx45deg

Protected <0.5mmx45deg




The refractive index of the monocrystalline silicon material is about 3.42, and the reflectivity of the silicon lens after polishing is about 30% in the air environment. Our common silicon lens and silicon window can be coated on the surface (Antireflection Coating), which can reduce the reflectivity to less than 1.5% between 3 to 5 um.

  Some silicon elements, especially the silicon protected windows, are exposed to dust, acid, salt and so on in the harsh environment. The conventional multilayer antireflection coating will be damaged and affect the normal work of the equipment. At this time, we need to make DLC coating on the surface of the silicon lens.




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