Control and tuning of a suspended Fabry-Perot cavity using digitally-enhanced heterodyne interferometry
arXiv:1704.03571 · doi:10.1364/OL.37.004952
Abstract
We present the first demonstration of real-time closed-loop control and deterministic tuning of an independently suspended Fabry-Perot optical cavity using digitally-enhanced heterodyne interferometry, realising a peak sensitivity of 10 pm over the 10-1000 Hz frequency band. The methods presented are readily extensible to multiple coupled cavities. As such, we anticipate that refinements of this technique may find application in future interferometric gravitational-wave detectors.