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We have developed and tested an antireflection (AR) coating method for silicon lenses used at cryogenic temperatures and millimeter wavelengths. Our particular application is a measurement of the cosmic microwave background. The coating consists of machined pieces of Cirlex glued to the silicon. The measured reflection from an AR-coated flat piece is less than at the design wavelength. The coating has been applied to flats and lenses and has survived multiple thermal cycles from 300 to . We present the manufacturing method, the material properties, the tests performed, and estimates of the loss that can be achieved in practical lenses.
© 2006 Optical Society of America
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