Optical Grade Silicon

Float zone, optical grade Silicon manufactured by Topsil, is now available from Valley Design Corp. In ingot form, as-cut wafers, etched, lapped or polished in sizes up to 150mm.

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 inventory consists of several thousand kilograms of Silicon in various forms, and sizes in <1·1·1> and <1·0·0> orientation, N and P-type, 1", 2", 3", 100 mm, 125 mm, 150 mm and odd sizes on special orders. With this large quantity of Silicon to choose from and our 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, Other important information.

Return to Home Page Optical polishing, lapping, dicing and optical components polishing

Updated: 27 September 2008

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