An adaptable two-lens high-resolution objective for single-site resolved imaging of atoms in optical lattices

Year: 2019

Authors: Gempel M. W., Hartmann T., Schulze T. A., Voges K.K., Zenesini A., Ospelkaus S.

Autors Affiliation: Leibniz Univ Hannover, Inst Quantenopt, D-30167 Hannover, Germany

Abstract: In this paper, we present a high-resolution, simple, and versatile imaging system for single-site resolved imaging of atoms in optical lattices. The system, which relies on an adaptable infinite conjugate two-lens design, has a numerical aperture of 0.52, which can in the ideal case be further extended to 0.57. It is optimized for imaging on the sodium D-2-line but allows us to tune the objective?s diffraction limited performance between 400 nm and 1000 nm by changing the distance between the two lenses. Furthermore, the objective is designed to be integrated into a typical atomic physics vacuum apparatus where the operating distance can be large (>20 mm) and diffraction limited performance still needs to be achieved when imaging through thick vacuum windows (6 mm to 10 mm). Imaging gold nanoparticles, using a wavelength of 589 nm which corresponds to the D-2-line of sodium atoms, we measure diffraction limited performance and a resolution corresponding to an Airy radius of less than 0.7 mu m, enabling potential single-site resolution in the commonly used 532 nm optical lattice spacing.

Journal/Review: REVIEW OF SCIENTIFIC INSTRUMENTS

Volume: 90(5)      Pages from: 053201-1  to: 053201-7

More Information: We acknowledge financial support from the Center for Quantum Engineering and Space-Time Research (QUEST) and the European Research Council through ERC Starting Grant POLAR. M.G. and T.H. acknowledge the support from the Research Training Group 1729 and K.V. from the Research Training Group 1991. We further wish to thank the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Sill Optics (Wendelstein), the workshop of the Institut fur Quantenoptik (IQ), and the Laboratory of Nano and Quantum Engineering (LNQE) of Leibniz Universitat Hannover.
KeyWords: Cold Atoms, Microscopy, Cold Molecules
DOI: 10.1063/1.5086539

Citations: 4
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