Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.91: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
A Single Laser System for Ground State Cooling of 25Mg+ — •Florian Gebert, Börge Hemmerling, Yong Wan, Ivan V. Sherstov, and Piet O. Schmidt — QUEST Inst. for Exp. Quantum Metrology, PTB Braunschweig and Leibniz Univ. of Hannover, Germany
We present a single solid-state laser system to cool, coherently manipulate and detect 25Mg+ ions confined in a linear Paul trap. Coherent manipulation is accomplished by coupling two hyperfine ground state levels using a pair of far-detuned Raman laser beams. Resonant light for Doppler cooling and detection is derived from the same laser source using the sidebands of an electro-optic modulator. With this setup we cooled the axial vibrational mode of a single 25Mg+ ion to the ground state using resolved sideband cooling. Its performance is studied by the time evolution of the Raman-stimulated sideband transitions. Our Setup is a major simplification over existing state-of-the-art systems, typically involving up to three separate laser sources. With this setup we will perform direct frequency comb spectroscopy using quantum logic to determine important transitions of Ca+, Ti+ and Fe+ for the comparison with quasar absorption spectra to study possible time variation of the fine structure constant α. In our experiment the quantum logic scheme [2] will be used for cooling and state detection. Another application of our setup will be the cooling of molecular ions to their internal ground state.
[1] B. Hemmerling et al., arXiv:1010.5664v1 [quant-ph]
[2] P. O. Schmidt et al., Science 309, 749-752 (2005)