First Measurements of High Frequency Cross-Spectra from a Pair of Large Michelson Interferometers
First Measurements of High Frequency Cross-Spectra from a Pair of Large Michelson Interferometers
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DOI：
10.1103/physrevlett.117.111102
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发表时间：
2016-09-06
影响因子：
8.6
通讯作者：
Weiss, Rainer
中科院分区：
文献类型：
--
作者：
Chou, Aaron S.;Gustafson, Richard;Weiss, Rainer
报道了来自费米实验室全息仪的差动位置信号频谱的互相关测量。费米实验室全息计是一对共置的39米长的高功率迈克尔逊干涉仪，在MHz范围内具有平坦的宽带频率响应。该仪器获得了对高频相关信号的灵敏度，远远超过了该仪器3.8 MHz反向光穿越时间的宽频带内的任何先前测量。主要但不相关的散粒噪声以381赫兹的频率分辨率在2 x 10(8)个独立的频谱测量上进行平均，以获得对平稳信号的2.1 x 10(-20)m/根赫兹的灵敏度。对于信号带宽Delta f>；11 kHz，对应变h或经典或奇异来源的剪切功率谱密度的灵敏度超过了具有里程碑意义的PSD增量h<；t(P)，其中t(P)=5.39 x 10(-44)/Hz是普朗克时间。
Measurements are reported of the cross-correlation of spectra of differential position signals from the Fermilab Holometer, a pair of colocated 39 m long, high power Michelson interferometers with flat broadband frequency response in the MHz range. The instrument obtains sensitivity to high frequency correlated signals far exceeding any previous measurement in a broad frequency band extending beyond the 3.8 MHz inverse light-crossing time of the apparatus. The dominant but uncorrelated shot noise is averaged down over 2 x 10(8) independent spectral measurements with 381 Hz frequency resolution to obtain 2.1 x 10(-20)m/root Hz sensitivity to stationary signals. For signal bandwidths Delta f > 11 kHz, the sensitivity to strain h or shear power spectral density of classical or exotic origin surpasses a milestone PSD delta h < t(p) where t(p) = 5.39 x 10(-44)/Hz is the Planck time.