Probing a single atom with 100.000 lasers: Direct frequency comb spectroscopy

PhD defence, Monday 4 December 2017, Steffen Meyer.

2017.12.04 | Karen Konradi

Steffen Meyer

During his studies, Steffen Meyer demonstrated for the first time coherent manipulation of a single trapped and cooled ion by driving stimulated Raman transitions in the THz range with a frequency comb.
This new technique is extremely versatile for investigating atomic and molecular energy structure over many orders of magnitude from the GHz to the THz range with just a single laser.
In particular, Steffen used this technique to measure the fine-structure splitting of the D levels in Ca+ with state-of-the-art accuracy, obtaining 1 819 599 021 524 +- 32 Hz.
Furthermore, he applied the technique to measure spectroscopic isotope shifts in Ca+ with the highest accuracy reported in literature so far.
Spectroscopic isotope shifts depend on the interaction of the electrons with the atomic nucleus, and their precise measurement can be used to test theories predicting "new physics" beyond the standard model, thereby complementing large scale experiments such as the LHC, on a smaller energy range.

Time: Monday, 4 December 2017, 13:00
Place: Building 1525, room 626, Department of Physics and Astronomy, Ny Munkegade 120, Aarhus University, 8000 Aarhus C.
Title of dissertation: Frequency Comb Driven Raman Transitions in the THz Range: High Precision Isotope Shift Measurements in Ca+
Contact information: Steffen Meyer, e-mail:, tel.: +45 87155671​​​​
Members of the assessment committee:
Chargée de recherche au CNRS Caroline Champenois, Aix Marseille Université, CNRS - Centre de St Jérôme, Marseille Cedex, France
Professor Roee Ozeri, Department of Physics of complex Systems, Weizmann Institute of Science, Rehovot, Israel
Associate Professor Georg Bruun, Department of Physics and Astronomy, Aarhus University (chair)
Main supervisor:
Professor Michael Drewsen, Department of Physics and Astronomy, Aarhus University
Language: The PhD dissertation will be defended in English

The defence is public.
The dissertation is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, building 1520, rooms 128-134, 8000 Aarhus C.

PhD defence
Comments on content: 
Revised 22.03.2018