Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Towards a two-photon optical clock in calcium

Jul 19, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Precision measurement and tests of fundamental physics Poster session


Two-photon transitions in neutral atoms are attractive candidates for the development of compact and portable optical clocks. Such clocks can be used to search for dark matter and dark energy, to build a gravitational wave telescope, to perform ultra-precise surveys of the earth's gravitational potential, and to serve as the foundation for the new definition of the SI second. The Doppler- and recoil-free nature of two-photon transitions eliminates the need for confinement of the atoms at ultracold temperatures. Clock precision of $\delta \nu/\nu \approx 10^{-16}/\sqrt{\tau}$ can be achieved without the need for an optical lattice or ion trap, both of which would introduce Stark shifts. Although it was historically thought that large probe laser light shifts were inevitable due to the high laser power required to drive two-photon transitions, we have developed a system of magic polarization to eliminate this shift. We report on progress towards the observation of the $4s^2 \; ^1S_0 \rightarrow 3d4s \; ^1D_2$ two-photon clock transition at 915 nm in a cloud of freely-falling $^{40}$Ca atoms.

Presenter name Shira Jackson
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Primary authors

Shira Jackson (University of Toronto) Dr Scott Smale (University of Toronto) Prof. Amar Vutha (University of Toronto)

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