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A: Fachverband Atomphysik

A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 34.3: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Towards resolved sideband cooling in an atom-ion hybrid trap — •Joschka Wolf, Artjom Krükow, Arne Härter, Amir Mohammadi, Tobias Schnetzer, and Johannes Hecker Denschlag — Institut für Quantenmaterie, Universität Ulm, Albert-Einstein Allee 45, 89081 Ulm, Germany

We investigate the properties of a ¹³⁸Ba⁺ ion immersed in a bath of ultracold ⁸⁷ Rb atoms. In the quest for a new level of control of the Ba⁺ ion in our atom-ion apparatus, we want to implement a resolved sideband cooling system. There are some challenges connected to realizing such a system. First a narrow band laser tuned to the 6S_1/2 → 5D_5/2 shelving transition at 1762 nm is needed. To achieve a linewidth much smaller than the typical trapping frequencies of our Paul trap (40 kHz) and a daily frequency drift in the sub kHz regime, we set up a high-Q optical cavity. In order to stabilize the laser to this cavity we need a precise and flexible locking scheme. For this we will use a broadband electro-optical modulator operated in a two-tone configuration [1]. In addition to this shelving laser, we need a second laser resonant to the 5D_5/2 → 6P_3/2 transition in order to deshelve the ion. Employing a sum frequency mixing technique, we will generate the 614 nm light using two high-power lasers at 1064 nm and 1450 nm, respectively. In this poster we show our progress and the capabilities of such a system.

[1] J.I. Thorpe, K.Numata, J.Livas, Opt. Expr. 16 15980(2008)