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A: Fachverband Atomphysik

A 30: Precision Measurements and Metrology II (joint session Q/A)

A 30.11: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Active optical clocks: Towards continuous superradiance on the clock transition of strontium — •Sheng Zhou, Francesca Famà, Camila Beli Silva, Stefan Alaric Schäffer, Shayne Bennetts, and Florian Schreck — Institute of Physics, University of Amsterdam

Active optical clocks based on superradiance have been proposed to directly obtain light with the stability of an atomic transition [1]. This approach decouples clock performance from limitations in ultrastable resonators, and could dramatically reduce limitations due to cavity pulling and required averaging times.

Superradiant pulses have been experimentally demonstrated on the 1S0-3P0 'mHz' transition of 87Sr [2]. However, continuous operation is needed to achieve state-of-the-art performance.

We will describe a continuous superradiant laser using the mHz clock transition of strontium. Our approach is based on loading a cold atomic beam [3] of 3P0 excited atoms into a moving magic lattice propagating along the mode of a bow-tie cavity. In this way, large numbers of atoms can be loaded along the cavity mode while maintaining low atomic densities and long lifetimes [5]. Using the fluxes from [3] and [4], an estimation of emitted powers of 0.3 pW for 87Sr and 9 pW for 88Sr should be possible with our setup.

[1] Meiser et al., PRL 102, 163601 (2009). [2] Norcia et al., Phys. Rev. X, 8, 021036 (2018). [3] Chen et al., Phys. Rev. Applied 12, 044014, (2019). [4] Escudero et al., Phys. Rev. Research 3, 033159 (2021). [5] Cline et al., E08.09, DAMOP (2021).