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A: Fachverband Atomphysik

A 26: Poster – Ultracold Matter (joint session Q/A)

A 26.32: Poster

Wednesday, March 4, 2026, 17:00–19:00, Philo 2. OG

Towards an optical lattice for lithium-6 at 841 nm — Christian Partes and •Magnus Rusch — Universität Tübingen, Physikalisches Institut, Auf der Morgenstelle 14, 72076 Tübingen

We present the status of our technical preparation for imaging lithium-6 (Li) atoms in a two-dimensional optical lattice using optical tweezers. The lattice operates at 841 nm to match the tune-out wavelength of erbium which is used for sympathetic cooling.

Due to the low mass of the Li atoms, high-frequency intensity noise of the lattice beam may cause significant heating of the gas, so the laser power has to be actively stabilized up to the MHz-range. We provide insight into the current status of our intensity control setup making use of an acousto-optic modulator and an FPGA-based PI-controller.

Additionally, we present the preparation of a two-dimensional optical tweezer array using a spatial light modulator (SLM) and near-resonant light. The SLM phase pattern is controlled by a two-stage Gerchberg-Saxton algorithm, employing both numerical and camera feedback. We aim for a tweezer distance equal to twice the lattice spacing.

Keywords: imaging lithium; optical tweezer; optical lattice; spatial light modulator; acousto-optic modulator