Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.25: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Non-cryogenic fiber amplifier for optical trapping of neutral mercury — •Holger John and Thomas Walther — Technische Universität Darmstadt, Institut für Angewandte Physik, 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. On the one hand the fermionic isotopes could be used to develop a new time standard based on a optical lattice clock employing the 1 S0 - 3 P0 transition. Another interesting venue is the formation of ultra cold Hg-dimers employing photo-association and achieving vibrational cooling by employing a special scheme.
The requirements for trapping neutral mercury are given by the cooling transition at 253.7 nm with a linewidth of 1.27 MHz. Our approach is to frequency double a Yb-doped fiber amplified ECDL twice with the fundamental wavelength of 1014.8 nm.
In the recent past fiber amplifiers cooled to cryogenic temperatures have been used due to the high absorption at room temperature. We have developed a non-cryogenic setup which shows a slope-efficiency of more than 35 % and a beam and polariation stability of more than 95 % without any disturbance by the cooling system. We will report on the status of the experiments.