title: Control and tuning of a suspended Fabry-Perot cavity using digitally enhanced heterodyne interferometry.
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, realizing 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.
authors.affiliation: Centre for Gravitational Physics, The Australian National University, Canberra, Australian Capital Territory 0200, Australia. john.miller@anu.edu.au
authors.forename: John
authors.initials: J
authors.lastname: Miller
authors.forename: Silvie
authors.initials: S
authors.lastname: Ngo
authors.forename: Adam J
authors.initials: AJ
authors.lastname: Mullavey
authors.forename: Bram J J
authors.initials: BJ
authors.lastname: Slagmolen
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Shaddock
authors.forename: David E
authors.initials: DE
authors.lastname: McClelland