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Abstract

This thesis reports on the development and characterization of a new ultracold atomic mixture experiment, featuring the bosonic species 23Na and 39K. With precise control over both inter- and intra-species interactions, this system serves as an ideal experimental platform for probing demixing dynamics with controlled miscibility. We set up new laser systems for both atomic species, alongside magnetic field coilsfeaturing precise control, crucial for trapping and adjusting interaction strengths. Additionally, we established and characterized a high-resolution imaging system, proving indispensable for detecting Bose-Einstein condensates. Following evaporative cooling in a crossed optical dipole trap, a 23Na Bose-Einsteincondensate comprising approximately 7×10^4 atoms was achieved. With both, 39K and 23Na, in the trap, we performed atom-loss spectroscopy measurements, identifying several intra- and inter-species Feshbach resonances, providing valuable insights into the different interaction regimes. Substantial three-body losses in this atomic mixture at low magnetic fields pose significant challenges, impeding the achievement of dual-species condensation to date. We give perspectives for the improvement of the cooling strategy to minimize the time spent at these low magnetic fields.