Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.79: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Cryogenic fiber amplifier for optical trapping of neutral mercury — •Holger John, Patrick Villwock, and Thomas Walther — Technische Universität Darmstadt, Institut für Angewandte Physik, Laser- und Quantenoptik, Schlossgartenstraße 7, 64289 Darmstadt
Laser-cooled mercury constitutes an interesting starting point for various experiments in particular in light of the existence of bosonic and fermionic isotopes in relatively high natural abundance. On the one hand the fermionic isotopes could be used to develop a new time-standard based on a lattice optical clock employing the 1 S0 - 3 P0 transition at 265.6 nm. Another interesting venue is the formation of ultra cold Hg-dimers employing photo-association and achieving vibrational cooling by employing a special pumping scheme.
The requirements for trapping neutral mercury are given by the cooling transition with a linewidth of 1.27 MHz at a wavelength of 253.7 nm. Our approach is to twice frequency double a Yb:disc laser with the fundamental wavelength of 1014.8 nm. In the recent past we have successfully trapped the bosonic 202 Hg as well as the fermionic 199 Hg isotopes and have performed first temperature measurement.
Our goal is to increase the reproducibility of our setup by substituting the thin-disc laser with a Yb doped fiber amplified ECDL. We will report on the status of the experiments.