Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 27: Ultracold Atoms and Molecules II (joint session Q/A)
A 27.3: Vortrag
Donnerstag, 17. März 2022, 14:45–15:00, Q-H10
Real-Time detection and feedback cooling of the secular motion of an ion — •Hans Dang1,2, Martin Fischer1, Atish Roy1, Lakhi Sharma1, 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 direct observation of the secular motion of a single ion by imaging it onto a knife-edge using a deep parabolic mirror. The unique misalignment functionals of the phase front of the light collected by the mirror together with its high collection efficiency[1] allow us to detect the motion in a time shorter than the coherence time of
the harmonic motion of the ion. Using a known oscillation amplitude to calibrate the detection the temperature of the ion can be extracted from the rms voltage of the measured signal. By applying the phaseshifted and amplified signal to one of the compensation electrodes of the ion trap it is possible to dampen the amplitude of the harmonic oscillation and hence cool the ion. Prospects of expanding the detection to all three motional modes simultaneously will be discussed.
[1] R. Maiwald et al., Physical Review A 86, 043431 (2012)