Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 55: Poster II
Q 55.18: Poster
Thursday, March 11, 2010, 16:00–19:00, Lichthof
A high-flux source of guided ultracold chromium atoms — •Valentin Viktorovich Volchkov, Anoush Aghajani-Talesh, Markus Falkenau, Axel Griesmaier, and Tilman Pfau — Universität Stuttgart, 5. Physikalisches Institut
A continuous source of cold atoms is a vital ingredient for realizing continuous atom lasers. The presented apparatus delivers a magnetically guided, ultracold beam of chromium atoms at a flux of 109 atom/s [1]. This beam is obtained by operating a MOT directly inside a magnetic guide. We discuss a proposal to continuously load a deep optical dipole trap from the atomic beam. To this end, a scheme of an atomic diode is presented: a magnetic field barrier within the optical dipole trap removes the kinetic energy of the atoms, while optical pumping into the lowest energy state removes the potential energy and traps the atom at the bottom of the combined trap. This mechanism will allow for continuous trapping and fast loading of the ODT. Recently, transverse laser cooling of the guided atoms has been demonstrated [2]. The resulting radial temperature yields, according to our simulations [3], a much higher loading efficiency of the trap.
[1] A Griesmaier et al. J. Phys. B. 42 145306 (2009).
[2] A Aghajani-Talesh et al. Submitted to New J. Phys.
[3] A Aghajani-Talesh et al. J. Phys. B. 42 245302 (2009).