Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster: Quantum Optics and Photonics I

Q 25.25: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Atrium Informatik

Analytical tailor-made optical potentials using a phase-only Spatial Light Modulator (SLM) — •Tobias Hammel, Lukas Palm, Philipp Preiß, and Selim Jochim — Physikalisches Institut, University of Heidelberg, Germany

One of the main tasks in quantum simulations with cold atoms is engineering the Hamiltonian of interest. To this end, SLMs have been shown to be particularly useful tools for the generation of high-quality, arbitrary light fields.

In this poster we show an analytic approach for the calculation of the required holograms on the SLM to get the desired optical potential in the atom plane. Because every optical setup adds unwanted phase aberrations onto the beam we discuss numerical ways to correct for those phase aberrations and measure the residual aberrations of the wave fronts to be of the order of one percent of the wavelength. Furthermore we show a way to correct for non-uniform illumination of the SLM chip caused by the Gaussian envelope of the incident light field and quantify the resulting uniformity of the beam amplitude.

In our setup we use an Amplified Spontaneous Emission (ASE) light source at 1064 nm with a coherence length of about 1mm. This prevents reflections from interfering with the trapping potential and reduces unwanted fringing. We can thus increase the quality of the programmable atom traps.

Those improvements will help to realize various physical systems, for example Quantum Hall states in few fermion systems.