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Journal of Russian Laser Research

Observation of Rydberg Transitions in Resonance Fluorescence of Ultracold Lithium-7 Atoms

Vladimir A. Sautenkov, Sergey A. Saakyan, E V Vilshanskaya, Boris B. Zelener, B. V. Zelener

Published Mar 1, 2015• 12 citations
Publisher
DOI
10.1007/s10946-015-9492-1

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Journal of Physics Conference Series•Nov 1, 2016•1 citation
In this work, we discuss two-photon excitation and diagnostic of ultracold Rydberg atoms in a magneto-optical trap. Lithium atoms were excited by using ultraviolet cw laser. For identification of Rydberg transitions, we recorded resonance fluorescence of ultracold atoms. Spectra of transitions 2P- n S, 2p- n D were measured. Our results are in good agreement with calculations and experimental data available in literature. Presented work is a part of our project focused on preparation and study of Rydberg matter and ultracold plasma.
The spectra of excited lithium-7 atoms prepared in a magneto-optical trap are studied using a UV laser. The laser diagnostics of the energy of Rydberg atoms is developed based on measurements of the change in resonance fluorescence intensity of ultracold atoms as the exciting UV radiation frequency passes through the Rydberg transition frequency. The energies of various nS configurations are obtained in a broad range of the principal quantum number n from 38 to 165. The values of the quantum defect and ionization energy obtained in experiments and predicted theoretically are discussed.