Silicon
Silicon
Silicon
Silicon
Silicon
Silicon
Silicon

Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5 - 8 micron region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission applications, but it is frequently used for laser mirrors because of its high thermal conductivity and low density. Silicon is also useful as a transmitter in the 20 micron range.

 

Main Properties:

Crystal Class

Cubic

Lattice Parameter

a=5.43Å

Melting Point

1417℃

Mohs Hardness

7

Transmission Band

1.5-8um

Density

2.329g/cm3

Young’s Modulus

130.91 GPa @40℃

Thermal Conductivity

1.63W/cm/K

Specific Heat

0.18cal/g/K @25℃

Thermal Expansion

2.6x10-6/℃ @20℃

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Wavelength, µm

1.40

1.50

1.66

1.82

2.05

2.50

3.50-5.00

6.00-25.00

Refractive Index

3.49

3.48

3.47

3.46

3.45

3.44

3.43

3.42


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