Heidelberg 2015 – scientific programme

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A: Fachverband Atomphysik

A 18: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 18.24: Poster

Tuesday, March 24, 2015, 17:00–19:00, C/Foyer

Ba⁺ and Rb laser system for ultracold chemistry experiments — •Georg Hoppe, Leon Karpa, Alexander Lambrecht, Julian Schmidt, and Tobias Schaetz — Albert-Ludwigs-Universität Freiburg

Our experimental setup is designed for the study of ultracold collisions [1] between Barium ions and Rubidium atoms in a BEC.

To reach the ultracold regime we first trap a Barium ion in a linear rf-Paul trap, where it’s prepared and Doppler cooled to temperatures of millikelvin. We then transfer the ion into an optical trap [2] to avoid rf-induced heating effects [3]. As next step Rubidium atoms will be used to sympathetically cool the ion to reach the ultracold temperature regime.

I will present our laser systems for cooling and preparation of the ions and atoms. The most important among them are the lasers for Doppler cooling (493nm, 780nm), repumping (650nm) and photoionisation (413nm), which is stabilized with a cavity. Additionally, we designed a diode laser at 780nm [4] as a Rubidium imaging system.

[1] M. Krych et al., Phys. Rev. Lett. 83, 032723 (2011)

[2] T. Huber et al., Nat. Commun. 5 (2014)

[3] A.T. Grier et al., Phys. Rev. Lett. 102, 223201 (2009)

[4] L. Ricci et al., Optics Commun., 117 (1995)