Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster: Quantum Optics and Photonics I
Q 15.13: Poster
Monday, March 23, 2015, 17:00–19:00, C/Foyer
Stabilization and site-resolved imaging of a few-fermion system — •Vincent M. Klinkhamer1, Justin F. Niedermeyer2, Andrea Bergschneider1, Simon Murmann1, Gerhard Zürn1, and Selim Jochim1 — 1Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Department of Physics and Astronomy, Washington State University, Pullman, WA, USA
In our few-fermion experiment, we manipulate a small number of interacting particles inside a variable optical trap. In order to expand the size of our system, we have improved the stability of our optical trap and implemented site-resolved imaging.
We create arrays of dimple traps by diffracting our trapping laser beam with an acousto-optic deflector (AOD). Thermal fluctuations and drifts with timescales between milliseconds and hours cause significant variations in the relative trap depths. We address this problem by monitoring the light of the trapping potential on a camera and feeding back to the AOD in real time.
After performing our experiments, we measure the outcome by taking a fluorescence image of our atoms. We can determine the atom number from the strength of the fluorescence signal, however, the photon recoil causes the atoms to diffuse. We plan to circumvent this by reducing the exposure time and imaging the scattered photons on an EMCCD. To identify the signal of the atoms on the image we apply a pattern-recognition algorithm.