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Dual-axis cubic cavity for drift-compensated multi-wavelength laser stabilisation

Authors :
Richard Hendricks
Ben Allen
Patrick Gill
Ian R. Hill
Geoffrey P. Barwood
Paul Gaynor
S. Donnellan
Source :
Optics express. 29(22)
Publication Year :
2021

Abstract

We describe a ‘clock control unit’ based on a dual-axis cubic cavity (DACC) for the frequency stabilisation of lasers involved in a strontium optical lattice clock. The DACC, which ultimately targets deployment in space applications, provides a short-term stable reference for all auxiliary lasers—i.e. cooling, clear-out, and optical lattice—in a single multi-band cavity. Long-term cavity drift is compensated by a feed-forward scheme exploiting a fixed physical relation to an orthogonal second cavity axis; either by reference to an ultrastable 698 nm clock laser, or by exploiting the differential drift between orthogonal axes extracted by a single laser in common view. Via a change of mirror set in the cavity axis accessed by the clock laser, the system could also provide stabilisation for sub-Hz linewidths at the 698 nm clock wavelength, fulfilling all stabilisation requirements of the clock.

Details

ISSN :
10944087
Volume :
29
Issue :
22
Database :
OpenAIRE
Journal :
Optics express
Accession number :
edsair.doi.dedup.....de21e70cae3c79b9bd32546d0fe88cb6