Berlin 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 1: Laser development and applications I
Q 1.4: Vortrag
Montag, 17. März 2014, 11:15–11:30, DO26 207
Fiber Amplifier for trapping ultra-cold mercury - a non-cryogenic approach — •Holger John 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. 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. In the past a twice frequency doubled Yb:disc laser has been used for trapping 202Hg and 199Hg. Due to the little gain at 1014.9 nm of Yb at room temperature stable long time operation of the thin disk laser is hardly possible.
By cooling a Yb-doped fiber to a temperature of 223 K first measurements have shown a slope-efficiency of more than 30 % and a beam and polariation stability of more than 95 % without any influence by the cooling system.
Our goal is to set up an efficient Yb doped fiber amplified ECDL for substituting the thin-disc laser. We will report on the status of the experiments.