Mirror thermal noise in flat-beam cavities for advanced gravitational wave interferometers
Mirror thermal noise in flat-beam cavities for advanced gravitational wave interferometers
复制标题
先进引力波干涉仪平光束腔中的镜像热噪声
DOI：
10.1088/0264-9381/22/7/012
复制
发表时间：
2005
影响因子：
3.5
通讯作者：
J. Vinet
中科院分区：
文献类型：
--
作者：
J. Vinet
已经提出在下一代引力波干涉仪的长腔中使用平坦光束而不是高斯光束，以便通过平均过程减少由镜面波动引起的读出噪声。因此，期望减少热弹性噪声以及传统的热噪声（或基底中的布朗噪声）。但仍然缺少直接计算。我们在这里提出了一个耦合到平面光束的镜子模型，并首先给出了无限基底情况下的传统热噪声的谱密度，然后给出了有限圆柱形基底的情况。
Use of flat instead of Gaussian beams in the long cavities of the next generation of gravitational wave interferometers has been proposed in order to reduce, by an averaging process, the readout noise caused by mirror surface fluctuations. It is thus expected to reduce the thermoelastic noise, and the conventional thermal noise (or Brownian noise in the substrate) as well. But a direct calculation was still missing. We present here a model of a mirror coupled to a flat beam and give the spectral density of conventional thermal noise first in the case of an infinite substrate, then for a finite cylindrical substrate.