Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.15: Poster

Dienstag, 12. März 2024, 17:00–19:00, KG I Foyer

A Digital Micromirror Device setup and feedback algorithm for enhanced control of two-dimensional potentials in cold atoms experiments — •Marcel Kern, Marius Sparn, Nikolas Liebster, Elinor Kath, Jelte Duchêne, Helmut Strobel, and Markus Oberthaler — Kirchhoff-Institut für Physik, Heidelberg, Deutschland

Spatial light modulators are widely used in ultracold atom experiments to produce arbitrary optical traps. A seemingly simple, but important example is the box potential. Also, for dynamic processes, such as the injection of vortices, more complicated, time-dependent potentials are needed. However, imperfections in the incident light and projection system perturbs the expected potential, requiring finer control of the light potential along with active correction.

In our two-dimensional Bose-Einstein condensate (BEC) experiment of 39-K atoms, a Digital Micromirror Device (DMD) illuminated with off-resonant light is used to configure the in-plane potential. A second DMD that uses near-resonant light will allow manipulations on different energy scales to optimize the existing potential and manipulate the BEC locally. Additionally, feedback algorithms optimizing on light and atom distributions will further increase the quality of the created light potentials. We present the planning and characterization of a second DMD setup, as well as the optimization algorithms developed for our experiment.

Keywords: Quantum gases in two dimensions; Atom-light interaction; Optimized dipole potential; Optimization algorithm; Digital Micromirror Device (DMD)