Optical Grade Silicon
Polished optical grade Silicon(Si) used for infrared (IR) and reflective optics applications, is available from Valley Design Corp. Float zone, optical grade Silicon can be provided in SEMI standard sizes, or custom sized, thinned and polished by Valley.
Although Silicon is primarily grown for semiconductor applications, it is the most economical IR material available. For optical use, Silicon is produced by the CZ crystal growth method or by the Float Zone growth method. Both P-type and N-type are acceptable for IR optics provided that they offer transmission greater than 50% in the 1.5 to 6 micron wavelength. Generally speaking, for N-type, the resistivity should be greater than 20 ohm-cm and, for P-type, greater than 40 ohm-cm. For use in the near IR, this is not so critical, but for applications for the far IR, resistivity can be critical. Float Zone Silicon most always meets criteria for optical use.
Available sizes in <1·1·1> and <1·0·0> orientation, N and P-type include 1", 2", 3", 100mm, 125mm, 150mm, 200mm and 300mm diameters and can also be custom sized or diced. With a readily available Silicon source, matched with our extensive shaping and polishing capabilities, Valley Design will assuredly meet your optical grade Silicon needs on short notice.
When requesting a quote or just to check our inventory, please include complete information: Quantity, Wafer diameter, Thickness, Type, Orientation <1·1·1> or <1·0·0>, Resistivity range, TTV (if important), Polishing, Edge condition (if applicable), Orientation flat specification, if other than SEMI standard.
Valley Design stocks N-type, P-type and Float Zone Silicon, but recommends that customers with optical applications check a small sample for transmission before making a larger purchase. Other polished infrared materials available from Valley Design are Germanium (Ge), Zinc Selenide (ZnSe) and Zinc Sulfide (ZnS).
Return to Home Page Optical polishing, lapping, dicing and optical components polishing