LIGO Document P030044-v1

Characterization of the LIGO 4km Fabry-Perot Cavities Via Their High-Frequency Dynamic Responses to Length and Laser Frequency Variations

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P - Publications
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16 Mar 2019, 15:45
Recent measurements at the LIGO Hanford Observatory have confirmed the predicted high-frequency dynamic response of km scale Fabry–Perot cavities to length and laser frequency variations. The dynamic response functions have been exploited to determine a number of cavity parameters including the cavity length and the resonance width. A new technique based on a variation of these measurements has been utilized to measure the interferometer arm cavity lengths with a precision of 80 μm. We present an overview of these measurements and discuss how the dynamic field responses could be used to measure the cavity g factors which are related to the mirror radii of curvature.
Fabry-Perot Cavity
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