Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Precision spectroscopy of atoms and ions (joint session A/Q)
A 20.14: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
Pound method of stabilizing the trap frequencies of an ion trap — •Martin Fischer1, Atish Roy1, Sebastian Luff1,2, Markus Sondermann1,2, and Gerd Leuchs1,2,3,4 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Friedrich-Alexander University Erlangen- Nürnberg (FAU), Department of Physics, Erlangen, Germany — 3Department of Physics, University of Ottawa, Canada — 4Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
We report on the stabilization of the secular motion frequencies of an ion trapped in the potential of a Paul-trap by analyzing the phase of the reflected trapping filed. This is done by mixing the field reflected from the LC-circuit[1] made up by the helical resonator and the trap with the RF-drive frequency. By adjusting the relative phase
of the two signals it is possible to determine how far the driving field is detuned from the resonance of the LC-circuit. Feeding this signal back to the RF-drive one can lock it to the resonance of the trap. In this way the power coupled into the trap system remains almost constant while the small relative variations of the drive field hardly
change the magnitude of the trap frequencies. The stability of the method is measured by directly monitoring the trap frequencies visible in the detected fluorescence light when it is filtered by imaging it onto a knife edge.
[1] R. V. Pound, Review of Scientific Instruments 17, 490-505 (1946)