Audio-band coating thermal noise measurement for Advanced LIGO with a multimode optical resonator
Audio-band coating thermal noise measurement for Advanced LIGO with a multimode optical resonator
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使用多模光学谐振器对高级 LIGO 进行音频波段涂层热噪声测量
DOI：
10.1103/physrevd.95.022001
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发表时间：
2016
影响因子：
5
通讯作者：
M. Evans
中科院分区：
文献类型：
--
作者：
S. Gras;H. Yu;W. Yam;D. Martynov;M. Evans
在现代高精度光学仪器中，例如在引力波探测器或频率参考中，反射涂层中的热诱导波动可能是一个限制性噪声源。这种噪声称为涂层热噪声，可以通过选择机械损耗低的材料来降低。为了进一步减少涂层热噪声，从而提高下一代仪器的灵敏度，对新材料的研究成为必要。我们提出了一种利用多厄米-高斯模式共共振的高精细度折叠腔直接测量涂层热噪声的新方法。该方法用于探测30-400 Hz频率范围内10-17 m/Hz数量级的地表波动。我们将该技术应用于先进LIGO中涂层的热噪声和损耗角的测量。
In modern high precision optical instruments, such as in gravitational wave detectors or frequency references, thermally induced fluctuations in the reflective coatings can be a limiting noise source. This noise, known as coating thermal noise, can be reduced by choosing materials with low mechanical loss. Examination of new materials becomes a necessity in order to further minimize the coating thermal noise and thus improve sensitivity of next generation instruments. We present a novel approach to directly measure coating thermal noise using a high finesse folded cavity in which multiple Hermite-Gaussian modes coresonate. This method is used to probe surface fluctuations on the order 10-17 m/Hz in the frequency range 30–400 Hz. We applied this technique to measure thermal noise and loss angle of the coating used in Advanced LIGO.