Opt⚙City ®-Quality Crystal & Optical Components
Silicon crystal is used as an optical window primarily in the 3 to 5 micron band and as a substrate for production of optical filters. Large blocks of Silicon with polished faces are also employed as neutron targets in Physics experiments.
With one of the lowest densities of the common IR materials, Silicon crystal is ideal for systems with weight constraints. Silicon crystal is harder than Germanium crystal and not as brittle. Silicon crystal is the lowest material cost option of all the IR materials. Silicon is diamond turnable.
Typical application: Thermal imaging, FLIR.
Surface Finish: Typical 40-20 or 60-40 scratch-dig. Diamond Turned 120
Angstroms rms or better.
Surface Flatness: Range from 1/2 wave to 2 waves @633nm depending on the system performance requirements.
Silicon is grown by Czochralski pulling techniques (CZ) and contains some oxygen which causes an absorption band at 9 microns. To avoid this, Silicon can be prepared by a Float-Zone (FZ) process. Optical Silicon is generally lightly doped ( 5 to 40 ohm cm) for best transmission above 10 microns. Silicon has a further pass band 30 to 100 microns which is effective only in very high resistivity uncompensated material. Doping is usually Boron (p-type) and Phosphorus (n-type)
OptoCity offer Silicon manufactured products: Silicon Lenses, Aspheric Lenses, Binary(Diffractive) Lenses, Windows, Optical Beamsplitters, Optical Filters, Wedges.
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