TY - JOUR
T1 - Loss factors of mirrors for a gravitational wave antenna
AU - Sato, Shuichi
AU - Miyoki, Shinji
AU - Ohashi, Masatake
AU - Fujimoto, Masa Katsu
AU - Yamazaki, Toshitaka
AU - Fukushima, Mitsuhiro
AU - Ueda, Akitoshi
AU - Ueda, Ken Ichi
AU - Watanabe, Koji
AU - Nakamura, Kenji
AU - Etoh, Kazuyuki
AU - Kitajima, Naoya
AU - Ito, Kazuhiko
AU - Kataoka, Izumi
PY - 1999/5/1
Y1 - 1999/5/1
N2 - Low-loss mirrors fabricated by ion-beam-sputtering machines for possible application in an interferometric gravitational wave antenna were evaluated by use of Nd:YAG laser light (λ = 1064 nm) with two distinct measurements: a tabletop experiment that used a short cavity with a small beam with a beam waist of approximately 2ω0 5 0.82 mm, and an optical test that used a 20-m prototypical gravitationalwave detector with a large beam with a beam waist of approximately 2ω0 = 4.4 mm. A multilayer coating comprised 29 layers of SiO2/Ta2O5 and one protective coating of SiO2. The best values obtained as a result of these measurements were 16 ppm (parts in 106) and 30 ppm in total loss, respectively. Also, a two-dimensional loss map generated by use of a small beam successfully revealed the existence of a loss structure within the coating surface. These results imply that a high-reflectance multilayer coating has some inhomogeneities and a loss distribution with a typical scale of a few millimeters and that the total measured losses depend on the beam spot size.
AB - Low-loss mirrors fabricated by ion-beam-sputtering machines for possible application in an interferometric gravitational wave antenna were evaluated by use of Nd:YAG laser light (λ = 1064 nm) with two distinct measurements: a tabletop experiment that used a short cavity with a small beam with a beam waist of approximately 2ω0 5 0.82 mm, and an optical test that used a 20-m prototypical gravitationalwave detector with a large beam with a beam waist of approximately 2ω0 = 4.4 mm. A multilayer coating comprised 29 layers of SiO2/Ta2O5 and one protective coating of SiO2. The best values obtained as a result of these measurements were 16 ppm (parts in 106) and 30 ppm in total loss, respectively. Also, a two-dimensional loss map generated by use of a small beam successfully revealed the existence of a loss structure within the coating surface. These results imply that a high-reflectance multilayer coating has some inhomogeneities and a loss distribution with a typical scale of a few millimeters and that the total measured losses depend on the beam spot size.
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U2 - 10.1364/AO.38.002880
DO - 10.1364/AO.38.002880
M3 - Article
C2 - 18319869
AN - SCOPUS:0037676509
SN - 1559-128X
VL - 38
SP - 2880
EP - 2885
JO - Applied Optics
JF - Applied Optics
IS - 13
ER -