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

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....

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Bibliographic Details
Published inOptics express Vol. 29; no. 22; pp. 36758 - 36768
Main Authors Hill, Ian R, Hendricks, Richard J, Donnellan, Sean, Gaynor, Paul, Allen, Ben, Barwood, Geoffrey P, Gill, Patrick
Format Journal Article
LanguageEnglish
Published 25.10.2021
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Summary: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.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.436019