Heidelberg 2015 – wissenschaftliches Programm
A 41.5: Vortrag
Freitag, 27. März 2015, 12:00–12:15, M/HS1
Two-photon ionization of a Bose-Einstein condensate — •Bernhard Ruff1,2, Alexander Grote3, Harald Blazy3, Harry Krüger3, Hannes Duncker3, Jasper Krauser3, Juliette Simonet3, Philipp Wessels1,3, Klaus Sengstock1,3, and Markus Drescher1,2 — 1Centre for Ultrafast Imaging, Hamburg, Germany — 2Institut für Experimentalphysik, Hamburg, Germany — 3Zentrum für optische Quantentechnologien, Hamburg, Germany
Hybrid quantum systems involving ultracold atoms and ions have undergone a spectacular development in the past years. Many approaches have been pursued to prepare such systems amoung which the combination of atom and ion traps, photoionization schemes or electron impact ionization.
We report on the investigation of a 87Rb condensate interacting with femtosecond laser pulses at 515 nm wavelength. The light pulses ionize atoms of the condensate within the focus region (7 µm waist) of the beam via two-photon absorption. The number of produced ions can be controlled by tuning the intensity or the wavelength of the laser pulses. We work in a regime where several thousands of ions are created in the quantum gas. The remaining atoms are detected by resonant absorption imaging, either in situ or after time-of-flight, which allows extracting the number of atoms and their temperature. First results on the relaxation of the condensate after interacting with one femtosecond laser pulse will be discussed.