Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 1: Ultra-cold atoms, ions and BEC I (with Q)
A 1.3: Talk
Monday, March 17, 2014, 11:00–11:15, BEBEL E34
Rapid production of a quantum gas of lithium using narrow-line cooling — •Ahmed Omran1, 2, Martin Boll1,2, Timon Hilker1,2, Thomas Reimann1,2, Alexander Keesling1,2, Konrad Viebahn1,2, Immanuel Bloch1,2, and Christian Gross1,2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str.1, 85748 Garching — 2Ludwig-Maximilians-Universität München, Fakultät für Physik, Schellingstraße 4, 80799 München
We present an all-optical method for cooling fermionic lithium atoms to degeneracy with a cycle time of 10s. Standard laser cooling of the atomic cloud is followed by a second stage of laser cooling along the narrow 2S1/2 → 3P3/2 transition at 323 nm, which yields a lower Doppler temperature [1]. To that end, we built a laser system for producing UV light using two nonlinear frequency conversions, which gives significantly more power than commercial solutions [2].
An optical dipole trap operating near a "magic wavelength", where the UV transition exhibits no light shift, directly captures the atoms from the UV MOT to evaporatively cool them to degeneracy using a Feshbach resonance. This efficient production of fermionic quantum gases is an important step towards our planned study of fermionic many body systems in optical superlattices.
[1] P. M. Duarte et al, Phys. Rev. A 84, 061406(R) [2011]
[2] A. C. Wilson, Appl. Phys. B 105, 741-748 [2011]