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Si - Silicon

American Photonics silicon is the most commonly used material for internal cavity fold mirrors and external beam delivery mirrors. The selection is mainly due to its low cost, thermal stability, and good durabilitiy. Silicon is also available from APC as optical grade for infrared transmitting applications.

APC can provide raw or generated blanks to most customer specifications. Circular, square or rectangular geometries are available. See APC's capabilities with optical fabrication and thin film coatings for more details.

sili
Mechanical Properties
Density (@293K)
2.329 g/cm3
Knoop Hardness
1100 kg/mm2
Mohs Hardness
7
Young's Modulus
130.91 GPa
Shear Modulus
79.92 GPa
Bulk Modulus
101.97 GPa
Poisson's ratio
0.28

 

Thermal Properties
Thermal Expansion
(K-1 @ 75 K) -0.5 X 10-6
(K-1 @ 293 K) 2.6 X 10-6
(K-1 @ 1400 K) 4.6 X 10-6
Thermal Conductivity
W/(mK) @ 125K 598.6
W(/mK) @ 313K 163.0
W/(mK) @ 400K 105.1
Specific Heat
cal/(gK) @ 298K 0.18
cal/(gK) @ 1800K 0.253
Debye Temperature
(K) 640
Refractive Index
Wavelength (µm)
1.4
1.5
1.66
1.82
2.05
2.5
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