Author/Authors :
Lau، Judy نويسنده , , Fowler، Joseph نويسنده , , Marriage، Tobias نويسنده , , Page، Lyman نويسنده , , Leong، Jon نويسنده , , Wishnow، Edward نويسنده , , Henry، Ross نويسنده , , Wollack، Ed نويسنده , , Halpern، Mark نويسنده , , Marsden، Danica نويسنده , , Marsden، Gaelen نويسنده ,
Abstract :
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.
