Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Poster I - Precisions Spectroscopy

A 10.2: Poster

Dienstag, 20. März 2007, 16:30–18:30, Poster B

Towards Direct Frequency Comb Spectroscopy using Quantum Logic — •Börge Hemmerling, Lukas An der Lan, and Piet O. Schmidt — Institut für Experimentalphysik, Universität Innsbruck, Austria

Modern physics theories allow for a variation of fundamental constants, such as the fine-structure constant. Searches for such a variation on a cosmological timescale are based on the interpretation of quasar absorption spectra. The sensitivity of these tests is limited by the availability of accurate laboratory spectrocopic data of atoms with a complex level structure [1]. A major difficulty in obtaining more precise data is the need for many different laser systems for probing, cooling and initial state preparation.

We report on the progress towards a flexible spectroscopy setup in which we plan to apply direct frequency comb spectroscopy to a cloud of spectroscopy ions trapped in a linear Paul trap that are sympathetically cooled via Mg⁺ ions. The appropriately tailored spectrum of the frequency comb is used for initial state preparation and spectroscopy. This allows us to study several different ion species that have resisted precision spectroscopy in the past.

[1] J. C. Berengut, V. A. Dzuba, V. V. Flambaum, M. V. Marchenko and J. K. Webb, arXiv:physics/0408017 (2006)