Silicon - Si
lenses, windows, mirrors, filters and prisms

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Primarily used as optical windows in the 3-5 micron region and as a substrate for optical filters. Silicon has low density and high thermal conductivity making it an ideal material to be used for laser mirrors. Grown by two different techniques, Czochralski (CZ) which contains some oxygen which causes an absorption band. Optical quality Silicon is normally lighted doped (5 to 40 ohm cm) and because it has a high refractive index it must be anti-reflection coated in order to achieve a high optical transmission.