Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Poster I
A 15.7: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster
Solid-state laser systems for photoionization, laser cooling and coherent manipulation of magnesium ions — •Daniel Nigg1, Börge Hemmerling1, Birgit Brandstätter2, Lukas An der Lan2, and Piet O. Schmidt1 — 1QUEST Institute for Quantum Metrology, Physikalisch-Technische Bundesanstalt and Leibniz University of Hannover, 38116 Braunschweig, Germany — 2Institut für Experimentalphysik, Universität Innsbruck, Austria
The challenges of performing precision spectroscopy with metal ions such as Ti+ and Fe+ arising from their complex level structure can be overcome by sympathetically cooling such ions and mapping their states via quantum logic methods to a more accessible ’logic’ ion.
This contribution focuses on the details of an all-solid state laser system for photoionization, laser cooling and coherent manipulation of magnesium ions, which are used for sympathetic cooling the ions of interest. A single fibre laser, which is frequency quadrupled using LBO and BBO crystals in combination with electro- and acousto-optical modulators provides all laser frequencies required for this task. The photoionization is implemented by frequency quadrupling a diode laser using a MgO-doped PPLN and a BBO crystal. This laser system is selective to the 1S-1P transition of neutral Mg at 285nm. The auto-ionizing excited state can then be excited into the continuum by the photoionization laser or the Doppler cooling laser for the magnesium ion.