Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 34: Poster VII

A 34.1: Poster

Thursday, March 14, 2024, 17:00–19:00, Tent B

Narrow-Linewidth Laser System for Optical Trapped Barium Ion Coulomb Crystals — •Wei Wu, Daniel Hoenig, Andreas Weber, and Tobias Schaetz — University of Freiburg, Institut of Physics, Hermann-Herder-Strasse 3, Freiburg 79104, Germany

We designed and implemented a 1762 nm laser system, specifically for driving the electric quadrupole transition from S1/2 to D5/2 states in Ba138 ions. The laser is locked to an 100 mm ULE cavity using PDH circuits and its wavelength is determined using a Michelson interfereometer. The laser system permits to discern the motional energy levels of ions within a optical dipole trap or Paul trap, which subsequently facilitates the implementation of Raman side-band cooling, enabling us to exert precise control over the ion temperature. Such presicion will significantly help us enhancing the understanding of the dynamics of the barium ion influenced by its colissions with ultracold lithium or rubidium atoms. Moreover it can be used to populate ions in a superposition of elecronic states, allowing for in-depth investigation of electronic state dependence of optical potential towards conditional stimulated phase transitions and their related superpositions.

Keywords: optical trapping; ion trap; optical qubit; quantum collisions