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A: Fachverband Atomphysik

A 13: Precision Measurements and Metrology I (joint session Q/A)

A 13.10: Poster

Dienstag, 15. März 2022, 16:30–18:30, P

An ytterbium setup for gravity measurements at VLBAI — •Ali Lezeik¹, Abhishek Purohit¹, Klaus Zipfel¹, Christian Schubert^1,2, Ernst M. Rasel¹, and Dennis Schlippert¹ — ¹Leibniz Universität Hannover - Institut für Quantenoptik — ²Institute for Satellite Geodesy and Inertial Sensing - German Aerospace Center (DLR)

Atoms such as strontium (Sr) and ytterbium (Yb) have no magnetic moments in their spin-singlet ground state making them nearly insensitive to external magnetic fields and hence appealing for precision measurements through atomic interferometry. Furthermore, Yb’s high mass and hence low expansion rate in addition to its narrow clock transition in the optical frequency range creates an ideal candidate for gravity measurements tests.

We present the Yb-174 setup for producing a robust, high-flux source of laser-cooled ytterbium atoms for the Very Large Baseline Atomic Interferometry (VLBAI) facility [1,2]. We present the laser system, the cooling sequence, the transfer cavity for frequency stabilization of the cooling beams, and a clock cavity for the 1156nm clock transition beam. We outline possible implementations of this system for atom-interferometric tests of the universality of gravitational redshift [3].

[1] É. Wodey et al., J. Phys. B: At. Mol. Opt. Phys. 54 035301 (2021)

[2] D. Schlippert et al., arXiv:1909.08524 (2019)

[3] C. Ufrecht, ..., C. Schubert, D. Schlippert, E. M. Rasel, E. Giese, arxiv:2001.09754 (2020)