PRODUCTS & SERVICES

PRODUCTS & SERVICES

Si lenses & windows

2020-06-24

Monocrystal Silicon is a sort of inert material with high hardness, and it is insoluble in water.

Monocrystal Silicon has very good transmission performance between 1 to 7µm. Meanwhile, the transmission in far-infrared band of this material is also very good, which is superior to other IR materials.

Monocrystal Silicon is normally used as substrate material for IR windows and filters in the 3-5 micron. And due to its high thermal conductivity and low density, monocrystal silicon is a common material used for laser reflectors.

Optical Properties:

Symbol    

Si

Atomic Number 

14

Crystal Growth Method

Czohralski (CZ) & Floatzone (FZ)

Orientation

Resistivity (Ω·cm)

3--50

Resistivity  homogeneity (%)

P Type<9   N Type<25

Melting Point ()   

1414

Density(g/cm3)

2.33

Thermal Expansion Coefficient (10-6/K

2.6

Oxygen content and tolerance (at cm-3)

5.07.8x107 ±0.5    

Carbon contentat cm-3

1.0x1016

Metal contentat cm-3

5.0x1010

Metal on surfaceat cm-3

Copper, chrome, iron, nickel, aluminum, zinc, natrium

Granule

μm)

Youngs Modulus (Gpa)  

165

Poisson’s Ratio

0.27

Specifications:

Silicon lenses:

Diameter or length tolerance     

Up to +0/-0.01mm

Tolerance of thickness  

Up to +/-0.01mm

Surface figure 

Up to λ/10 @632.8nm

Centration

Up to 5 arc seconds

ETV

≤0.02mm

Surface quality

Up to 10-5 Scratch & Digs

Clear aperture

Up to 100% of the diameter

Bevel

<0.2mmx45°

Coating

According to your request

Silicon windows:

Diameter or length tolerance

Up to +0/-0.01mm

Thickness tolerance

Up to +/-0.01mm

Surface figure  

Up to λ/20 @632.8nm

Parallelism

Up to 0.5 arc seconds

Surface quality

Up to 10-5 Scratch & Digs

Bevel

<0.2mmx45°

Coating

According to your request


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