EXTREMELY LOW TEMPERATURE COOLING WINDOW MATERIAL, EXTREMELY LOW TEMPERATURE COOLING APPARATUS FOR ASTRONOMICAL OBSERVATION DEVICE, AND EXAMINATION EQUIPMENT UTILIZING TERAHERTZ WAVE OBSERVATION

摘要

PROBLEM TO BE SOLVED: To provide a cooling window material which has an enlarged diameter of at least 170 mm together with characteristics of efficiently absorbing thermal infrared rays, improving thermal conductivity, improving transparency in a sub millimeter area and reducing a reflection loss, an extremely low temperature cooling apparatus for an astronomical observation device comprising the window material, and examination equipment utilizing terahertz wave observation.;SOLUTION: An electrical wave introduction window 13 of a cooling container 11 comprises a cooling window material 14 in which a monocrystal sapphire substrate is used as a base material, a cut face is formed as a C plane, and a thick anti-reflection film of silicon oxide (SiOx) is formed on a surface of the sapphire substrate.;COPYRIGHT: (C)2006,JPO&NCIPI