Author/Authors :
Shinji Miyoki، نويسنده , , Takayuki Tomaru، نويسنده , , Hideki Ishitsuka، نويسنده , , Masatake Ohashi، نويسنده , , Kazuaki Kuroda، نويسنده , , Daisuke Tatsumi، نويسنده , , Takashi Uchiyama، نويسنده , , Toshikazu Suzuki، نويسنده , , Nobuaki Sato، نويسنده , , Tomiyoshi Haruyama، نويسنده , , Akira Yamamoto، نويسنده , , Takakazu Shintomi، نويسنده ,
Abstract :
The reflectance of an ultra-low loss dielectric multilayer coating mirror, which was cooled at 10 K and exposed to 300 K vacuum space, was monitored as the finesse of a Fabry–Perot cavity for two months. The reflectance was measured to decrease with a rate of 0.12+0.12−0.08 ppm per day. Accounting for this result, the cryogenic system for a gravitational wave laser interferometer such as LCGT requires several tens of meters of radiation shields inside its vacuum ducts to keep its optical performance.
Keywords :
Ultra-low loss dielectric multilayer coating mirror , Reflectance , Finesse , Interferometric gravitational wave detector , Cryogenic contamination
