Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Posters: Quantum Optics and Photonics IV

Q 54.54: Poster

Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof

Characterization of phase noise in an optical lattice — •K. Chandrashekara, G. Ramola, R. Winkelmann, W. Alt, D. Meschede, and A. Alberti — Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, D-53115 Bonn, Germany

We report on the characterization and influence of phase noise in a two-dimensional state-dependent optical lattice [1]. We discuss how frequency noise of the laser used for generating the optical lattice translates into phase noise of the lattice. The frequency noise of the lattice laser (Ti:Sapphire) was characterized by the use of a in-house built optical frequency discriminator. We can avoid adverse effects due to frequency noise by measuring and reducing optical path length differences by which the phase noise can manifest at the position of the atoms. This allows us to prevent heating and loss of the ultracold Caesium atoms trapped in the lattice. Three methods were employed to first measure the path length differences: A geometric distance measurement, an optical measurement using interferometry and finally using fluorescence images of atoms. The use of atoms directly displays the extent to which the frequency noise can be detrimental to the experiment.

[1] C. Robens, S. Brakhane, W. Alt, D. Meschede, J. Zopes and A. Alberti, ``Fast, High-Precision Optical Polarization Synthesizer for Ultracold-Atom Experiments'', Phys. Rev. Appl 9, 034016 (2018)