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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 13 — May. 1, 1999
  • pp: 2880–2885

Loss factors of mirrors for a gravitational wave antenna

Shuichi Sato, Shinji Miyoki, Masatake Ohashi, Masa-Katsu Fujimoto, Toshitaka Yamazaki, Mitsuhiro Fukushima, Akitoshi Ueda, Ken-ichi Ueda, Koji Watanabe, Kenji Nakamura, Kazuyuki Etoh, Naoya Kitajima, Kazuhiko Ito, and Izumi Kataoka  »View Author Affiliations


Applied Optics, Vol. 38, Issue 13, pp. 2880-2885 (1999)
http://dx.doi.org/10.1364/AO.38.002880


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Abstract

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 2w0 = 0.82 mm, and an optical test that used a 20-m prototypical gravitational-wave detector with a large beam with a beam waist of approximately 2w0 = 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.

© 1999 Optical Society of America

OCIS Codes
(230.4040) Optical devices : Mirrors
(230.4170) Optical devices : Multilayers
(240.0310) Optics at surfaces : Thin films
(290.5820) Scattering : Scattering measurements
(310.1620) Thin films : Interference coatings

History
Original Manuscript: August 25, 1998
Revised Manuscript: January 4, 1999
Published: May 1, 1999

Citation
Shuichi Sato, Shinji Miyoki, Masatake Ohashi, Masa-Katsu Fujimoto, Toshitaka Yamazaki, Mitsuhiro Fukushima, Akitoshi Ueda, Ken-ichi Ueda, Koji Watanabe, Kenji Nakamura, Kazuyuki Etoh, Naoya Kitajima, Kazuhiko Ito, and Izumi Kataoka, "Loss factors of mirrors for a gravitational wave antenna," Appl. Opt. 38, 2880-2885 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-13-2880

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