17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Quasi-continuous superradiance on the kHz clock transition of 88Sr

20 Jul 2022, 17:00
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


Lasing in the superradiant or “bad cavity” regime has attracted interest in the optical clock community as it offers an alternative to conventional lasers limited by the thermal noise fluctuations of reference cavities. In our experiment, we investigate pulsed lasing on the 7.5 kHz clock transition of $^{88}$Sr atoms in an optical cavity. We continuously repump the lasing to achieve pulse durations on the ms scale, compared to a pulse length of a few $\mu$s using a single population inversion pulse. To observe the narrowing of the spectral line, we constructed an ultra-stable reference cavity system in order to characterize the spectral properties of the emission. Lastly, we experimentally investigate the prospect of using superradiant pulses as a readout of a Ramsey interferometer sequence. This scheme has the advantage of a fast, non-destructive measurement with increased sensitivity, which would be beneficial to the performance of optical atomic clocks.

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Presenter name Sofus Laguna Kristensen

Primary authors

Sofus Laguna Kristensen (Niels Bohr Institute) Eliot Bohr (Niels Bohr Institute) Jörg Helge Müller (Niels Bohr Institute)

Presentation Materials

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