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Q: Fachverband Quantenoptik und Photonik

Q 50: Poster Ultrakalte Atome

Q 50.8: Poster

Thursday, March 13, 2008, 16:30–19:00, Poster C2

Chromium atoms in a very deep optical trap — •Jimmy Sebastian, Anoush Aghajani-Talesh, Markus Falkenau, Axel Griesmaier, and Tilman Pfau — 5. Physikalisches Institut, Universität Stuttgart

We study the properties of a very deep (∼4mK) optical dipole trap for ultracold chromium atoms that is generated by a single 300W fibre laser at a wavelength of 1070nm. We load the dipole trap directly from a magneto optical trap. Due to the high intensity of the laser field, the atoms in the region of the dipole trap experience differential light shifts between ground state and excited state much larger than the line width of the cooling transition. Additionally, the shifts depend on the polarization of the dipole trap beam and on the magnetic states which strongly influences the cooling and loading mechanism in the trap.
We present spectroscopic measurements and calculations of the differential shifts and discuss strategies for optimal loading of optical traps in such a regime.