Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster: Quantum Optics and Photonics II
Q 27.57: Poster
Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof
Optical spectroscopy of Bloch bands in optical lattice — •Nandan Jha, Steffen Rühmann, Dominika Fim, Klaus Zipfel, Steffen Sauer, Waldemar Friesen, Felix Kegler, André Kulosa, Wolfgang Ertmer, and Ernst Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Deutschland
We report on our spectroscopy measurement of the spin forbidden 1S0 → 3P0 clock transition in laser cooled 24Mg in a shallow optical lattice. The narrow clock transition allows a measurement of the effect of Bloch band curvature in optical spectroscopy. This provides a magnified view of the possible frequency shift and broadening due to Bloch band curvature that may affect state of the art optical clocks. It has been previously shown that in the regime where the Rabi frequency is smaller than the energy width of the lowest Bloch band in the optical lattice, a modified lineshape with two shifted maxima is observed in the clock transition [1]. We perform sideband resolved measurements in the similar regime for 1000 24Mg atoms, trapped at 4 µK temperature in a shallow optical lattice of trap depths as low as 6 recoil energies. The optical lattice wavelength is varied in the vicinity of the 1S0 → 3P0 transition magic wavelength. We observe a dependence of the carrier lineshape on the lattice wavelength, and we demonstrate its application in measuring the magic wavelength.
[1] P. Lemonde and P. Wolf, Phys. Rev. A 72, 033409 (2005).