Journal
APPLIED OPTICS
Volume 45, Issue 16, Pages 3746-3751Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.45.003746
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- Division Of Physics
- Direct For Mathematical & Physical Scien [0855887] Funding Source: National Science Foundation
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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 1.5% at the design wavelength. The coating has been applied to flats and lenses and has survived multiple thermal cycles from 300 to 4 K. We present the manufacturing method, the material properties, the tests performed, and estimates of the loss that can be achieved in practical lenses. (c) 2006 Optical Society of America.
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