Silicon (Si)
Silicon is used as a mirror substrate for lasers because of its thermal conductivity, light weight, and hardness. Its is also used for windows and lenses in the 1.2m m to 6.7m m range. The refractive index is near 3.4 throughout the range. Silicon is also useful as a transmitter in the 20m m to 300m m range.
Due to the strong absorption at 9m, Silicon is not suitable for use with CO2 lasers as a transmitting optic but is widely used for CO2 mirror. The density of Silicon is only half that of Germanium, Gallium Arsenide and Zinc Selenide.
Silicon Constants
| Density | 2.33 g*cm-3 at 18°C |
| Young's Modulus | 1.067 x 1010 dynes/mm-2 |
| Poisson's Ratio | 0.44 |
| Moh Hardness | 7 |
| Specific Heat at 27°C | 0.171 cal/g°C |
| Coefficient of Linear Expansion at 300°C | 2.33 x 10-6/°C |
Standard Optical Components
| Diameter, mm | Thickness, mm |
Cat.-No |
Price, US$ |
12.5 (or 0.5") |
2.0 |
40701 |
69 |
25.0 (or 1") |
3.0 |
40703 |
79 |
38.0 (or 1.5") |
40705 |
99 | |
50.0 (or 2") |
5.0 |
40707 |
179 |
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