Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 18: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)

A 18.2: Vortrag

Mittwoch, 12. März 2025, 14:45–15:00, KlHS Mathe

Raman Transition Techniques for High-Precision Experiments in Collinear Laser Spectroscopy — •Julien Spahn, Hendrik Bodnar, Kristian König, and Wilfried Nörtershäuser — Institute for nuclear physics, TU Darmstadt, Germany

Benefitting from the drastic compression of the velocity width through an electrostatic acceleration by several 10 kV and, hence, overcoming Doppler broadening, collinear laser spectroscopy is a fast technique for precision measurements on dipole-allowed transtions. Being constantly refined, the natural linewidth of the dipole transition starts becoming a limiting factor. Raman transitions have a two orders of magnitude smaller linewidth than dipole transitions. While various applications utilizing Raman transitions have emerged over the years, techniques exploiting Raman transitions in collinear laser spectroscopy have so far been limited to hyperfine structure studies [1].
This contribution will present the results of recent measurements of the S_1/2→D_5/2 clock transition ⁸⁸Sr⁺ at COALA, used to benchmark the applied collinear Raman spectroscopy. The AC-Stark shift and two-photon Rabi oscillations were investigated, and the feasibility of performing laser spectroscopical HV measurements using a "Raman velocity filter" [2] was tested. Furthermore, an approach for Doppler-free collinear Raman spectroscopy employing two subsequent Raman transitions will be presented.
This project is supported by DFG (Project-ID 461079926).
[1] TP Dinneen et al., Physical Review A, 43, 1991
[2] A. Neumann et al., Physical Review A, 101, 2020

Keywords: Collinear Laser Spectroscopy; Raman Spectroscopy