Diffraction-limited Imaging and Trapping of Ultracold Ytterbium Atoms in Optical Tweezer Arrays

Gröters, David (5. Januar 2023): Diffraction-limited Imaging and Trapping of Ultracold Ytterbium Atoms in Optical Tweezer Arrays. Masterarbeit, Fakultät für Physik, Ludwig-Maximilians-Universität München.

Abstract

A new path for quantum gas experiments with high resolution is a combination of the advantages of highly uniform optical lattices with the flexibility offered by optical tweezer arrays. Those hybrid tweezer lattices require performant microscope objectives that can simultaneously image individual atoms in the optical lattice and generate diffraction-limited optical tweezers for single-site addressing. In this thesis the imaging performance is characterized for two custom made high-resolution objectives at 399 and 532 nm as well as the tweezer-generation capabilities with 532 nm light. To this end, we build and optimize an optical test setup that can perform automated focus scans with sub-wavelength axial step size to test the objective point spread function and optical tweezer generation. We confirm diffraction-limited operation in both cases for each objective and in a field of view of 100x100 μm. Furthermore we generate 2D tweezer arrays using two acousto-optical deflectors in a crossed configuration and characterize their shape in 3D. An in-depth discussion on the error estimates and various compensation techniques used for analysis is presented as well. Finally, we successfully integrate the objective into the main setup including the trapping and imaging of ultracold ytterbium atoms in a 5x5 optical tweezer array.

• Dokumententyp: LMU München: Studienabschlussarbeit
• Keywords: Optical tweezer; Ultracold atoms; Quantum simulation; Microscopy; Optics; Quantum physics; Laser physics; Diffraction limit
• Fakultät: Physik > Studienabschlussarbeiten
• Institut oder Departement: Lehrstuhl für Quantenphysik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• Sprache: Englisch

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