Silicon (Si)

 Monocrystalline silicon is an infrared optical material with excellent comprehensive cost performance. Optical grade Czochralski silicon (OCZ-Si) as a transmission grade material is widely used in the mid-infrared (3-5um) band, and the infrared transmittance exceeds 50%. Zone-melted monocrystalline silicon can be used in a wider band (1-14um), and high-purity zone-melted monocrystalline silicon (HPFZ-Si) can even be used in the far-infrared band (greater than 30um). The choice of silicon type depends on the wavelength range, component thickness and specific application.

 

Silicon (Si)  Descriptions

Single crystal silicon is a chemically inert material with high hardness and insoluble in water. It has good light transmission performance in the 1.2-7μm band, and it also has good light transmission in the far infrared band 300-300μm. Performance, which is a feature that other optical and infrared materials do not have. Silicon (Si) single crystals are usually used in the substrate of 3-5μm mid-wave infrared optical windows and optical filters. Because of the material's good thermal conductivity and low density, It is also a common material for making laser mirrors. The density of monocrystalline silicon is 2.316g/cm³, and the Knoop hardness is 1150, which is harder and less fragile than germanium.

 

Silicon (Si)  Specifications

Crystallographic

Growth Method

CZ OR FZ

Purity

>99.9999%

 

Refractive Index at n3.0

3.436

 

Refractive Index at n5.0

3.426

Optical

Thermal Coefficient of Refractive Index at 25 ℃

1.50 x 10-4

 

Transmission Range, microns

1.2 - 10, 50 - 100

 

Thermal Linear Expansion, ℃-1 for 25 ℃

2.55 x 10-6

 

Thermal Conductivity, W/(m * ℃) at 27 ℃

159

Thermal

Specific Heat Capacity, J/(kg * ℃)

0.712 x 103

 

Melting Point, ℃

1412

 

Density, g/cm3 at 20 ℃

2.33

 

Mohs Hardness

7

Mechanical

Young Modulus (E), Pa

1.89 x 1010

 

Shear Modulus (G), Pa

7.99 x 1010

 

Poisson Ratio

0.266

Chemical

Molecular Weight

28.09

Molecular Weight

insoluble

 

Ref. Index vs. Wavelength λ

 

Wavelength, Microns

Refractive Index

1.5

3.484

2

3.456

3

3.436

4

3.429

5

3.426

6

3.424

7

3.423

8

3.422

9

3.422

 

BRD optical co. Ltd is a professional optical products manufacturer, we provide optical component, optical mirror, lens silicone, silicone lenses, silicon lens and etc. Want to know more? Please contact us.

 


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