2003/01/31 by J. -M. Courty, J.-M Courty, A. Heidmann +3
Engineering · Physics and Astronomy · #Astronomical interferometer #Detector #Feedback loop #Geophysics and Sensor Technology #Interferometry #Loop (graph theory) #Mechanical and Optical Resonators #Noise (video) #Phase (matter) #Phase noise #Pulsars and Gravitational Waves Research #Sensitivity (control systems) #gr-qc #quant-ph
paper · pdf · doi:10.1209/epl/i2003-00527-x
published as Europhys.Lett.63:226-232,2003 · 4 pages, 3 figures, RevTeX
arxiv created 2003/05/22 · openalex publication_date 2003/07/01 · arxiv updated 2010/12/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We show that back-action noise in interferometric measurements such as gravitational-waves detectors can be completely suppressed by a local control of mirrors motion. An optomechanical sensor with an optimized measurement strategy is used to monitor mirror displacements. A feedback loop then eliminates radiation-pressure effects without adding noise. This very efficient technique leads to an increased sensitivity for the interferometric measurement, which becomes only limited by phase noise. Back-action cancellation is furthermore insensitive to losses in the interferometer.