Loss factors of mirrors for a gravitational wave antenna.
Loss factors of mirrors for a gravitational wave antenna.
复制标题
引力波天线镜子的损耗因数。
DOI：
10.1364/ao.38.002880
复制
发表时间：
1999
期刊：
影响因子：
1.9
通讯作者：
I. Kataoka
中科院分区：
文献类型：
--
作者：
S. Sato;S. Miyoki;M. Ohashi;M. Fujimoto;T. Yamazaki;M. Fukushima;A. Ueda;K. Ueda;K. Watanabe;K. Nakamura;K. Etoh;N. Kitajima;K. Ito;I. Kataoka
低损耗镜子捏造通过离子束溅射机可能的应用程序在一个干涉引力波天线被评估使用Nd: YAG激光(λ= 1064海里)与两种不同的测量:桌面实验,使用短腔小光束的束腰大约2 w(0) = 0.82毫米,和光学测试,使用一种20米典型的引力波探测器有一个很大的光束的束腰大约2 w(0) = 4.4毫米。多层涂层由29层SiO(2)/Ta(2)O(5)和1层SiO(2)保护涂层组成。通过这些测量获得的最佳值分别为总损失量的16 ppm（10(6)中的各部分）和30 ppm。此外，利用小光束生成的二维损耗图成功地揭示了涂层表面存在损耗结构。这些结果表明，高反射率多层涂层具有一定的不均匀性和损耗分布，其典型尺度为几毫米，并且测量的总损耗与光束光斑大小有关。
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 (lambda = 1064 nm) with two distinct measurements: a tabletop experiment that used a short cavity with a small beam with a beam waist of approximately 2w(0) = 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 2w(0) = 4.4 mm. A multilayer coating comprised 29 layers of SiO(2)/Ta(2)O(5) and one protective coating of SiO(2). The best values obtained as a result of these measurements were 16 ppm (parts in 10(6)) 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.