Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 12: Ultra-cold atoms, ions and BEC

A 12.21: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik

Repumping a strontium Zeeman slower — •Jens Samland^1,2, Rodrigo Gonzalez Escudero¹, Chun-Chia Chen¹, Shayne Bennetts¹, Benjamin Pasquiou¹, and Florian Schreck¹ — ¹Van der Waals - Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands — ²Physik-Department, Technische Universität München, Munich, Germany

We study a new repumping scheme for Sr aiming to reduce atom loss in Zeeman slowers (ZS). Typically, Sr atoms are laser-cooled in a ZS using the 5s5s1S0-5s5p1P1 transition. This transition is not fully cycling and about 1 in 50 000 atoms fall from the upper 5s5p1P1 state into the 5s4d1D2 state. There, they cannot be addressed and are therefore not decelerate and ultimately lost. Using the 448nm 5s4d1D2-5s8p1P1 transition we calculate that 98% of atoms can be repumped back to the 5s5s1S0 ground state within ~3 μs. To test this theory we are building a 448 nm external cavity diode laser which can be incorporated with the ZS of our steady-state atom laser experiment to measure any flux improvement [1]. The demonstration of an efficient repumper for strontium ZS could provide a performance boost for the rapidly expanding global fleet of strontium quantum gas and optical clock machines.

[1] S. Bennetts et al., Phys. Rev. Lett. 119, 223202 (2017).