Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster: Quantum Optics and Photonics II
Q 27.58: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Towards an optical lattice clock with bosonic 24Mg — •Steffen Sauer, Steffen Rühmann, Dominka Fim, Klaus Zipfel, Nandan Jha, Waldemar Friesen, Felix Kegler, André Kulosa, Wolfgang Ertmer, and Ernst Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Deutschland
We report on the progress towards a frequency measurement of 24Mg 1S0 → 3P0 clock transition in a deeper optical lattice, with a linewidth in the range of tens of Hz, which depends on the trap depth of the optical lattice potential. We have also implemented a new normalization scheme, leading to a better signal to noise ratio. Therefore we are able to measure the magic wavelength of the optical lattice, the clock transition frequency and the 2nd order Zeeman shift with a higher accuracy.
Since a Sub-Doppler cooling scheme is not available for Mg, we prepare the atoms in an elongated optical dipole trap using a continuous loading scheme [1]. Atoms are subsequently transferred to the 1D optical lattice, leading to a dilute cloud of 1000 atoms distributed over 130,000 lattice sites [2], reducing the atomic collisions which is an advantage for bosonic lattice clocks. Line broadening due to atomic tunneling between lattice sites is currently limiting the precision of our frequency measurement. Therefore, going forward, the new spectroscopy setup with deeper optical lattice should allow us to study the systematic effects e.g. tunneling effect, collisional shifts, blackbody radiation shift, Zeeman shift and ac Stark shift.
[1] M. Riedmann et al., Physical Review A, 043416 (2012).
[2] A. Kulosa et al., accepted for PRL, arXiv:1508.01118 (2015).