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/Hz 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.
@article{arxiv.1704.03571,
title = {Control and tuning of a suspended Fabry-Perot cavity using digitally-enhanced heterodyne interferometry},
author = {John Miller and Silvie Ngo and Adam J. Mullavey and Bram J. J. Slagmolen and Daniel A. Shaddock and David E. McClelland},
journal= {arXiv preprint arXiv:1704.03571},
year = {2017}
}