Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster: Quantum Optics and Photonics I
Q 15.62: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Lamb-Dicke spectroscopy of the 1S0 → 3P0 clock transition in bosonic magnesium — •Nandan Jha, André Kulosa, Steffen Rühmann, Dominika Fim, Klaus Zipfel, Steffen Sauer, Wolfgang Ertmer, and Ernst Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Deutschland
We report on a measurement of the magic wavelength of bosonic 24Mg. At this particular wavelength the differential AC-Stark shift between the clock states vanishes.
The experimental cycle for loading the optical lattice is as follows: 109 atoms are pre-cooled in two magneto-optical traps (singlet-MOT at 285 nm and triplet-MOT at 383 nm) and continuously loaded in an optical dipole trap at 1064 nm. 104 Atoms are then transferred to the optical lattice at 469 nm. In order to generate sufficient power for trapping of magnesium, the incident power of 90 mW is enhanced to 2 W in a build-up cavity.
An external homogeneous magnetic field gives a small admixture of the 3P1 state to the 3P0 state allowing direct excitation of the strongly forbidden 1S0 → 3P0 clock transition. From the spectroscopy signal we observe a clear asymmetry between the red and the blue sideband of the carrier, which infers that most of the atoms are in the vibrational ground state of the trap. Their temperature evaluates to 7 µK. We varied the lattice power at different wavelengths for measuring the differential AC-Stark shifts of the carrier transition. The magic wavelength of 24Mg results to 468.44(17) nm.