Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 39: Posters: Quantum Optics and Photonics III

Q 39.8: Poster

Wednesday, March 11, 2020, 16:30–18:30, Empore Lichthof

Laser light shaping and control for precision spectroscopy with ions — •Robin L. Stampa, André P. Kulosa, Chih-Han Yeh, Dimitri Kalincev, Henning A. Fürst, Laura S. Dreissen, and Tanja E. Mehlstäubler — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Coherent excitation of forbidden transitions, as used for example in optical clocks, sets stringent requirements on the ultra-stable probe laser. To provide sufficient power, the light source needs to be amplified. This can be accomplished by a slave diode laser. Here, we report on automatic re-locking of a slave laser at 411 nm employing a microcontroller for nearly 24/7 operation [1]. To reach the accuracy of optical clocks with efficiently reduced measurement time, simultaneous precision spectroscopy of forbidden transitions in trapped multi-ion Coulomb crystals can be advantageous. This requires equally distributed laser intensity onto the ions. We investigate different methods for this, while taking flexibility, reliability, and ion-light interaction efficiency into account, using either a spatial light modulator, micromirror arrays or holographic phase plates. Our result will not only be of interest for the operation of optical multi-ion clocks, but also for the study of dynamics in multi-ion Coulomb crystals [2]. Furthermore, it can be an important tool for the test towards Local Lorentz Symmetry breaking with multiple ions [3].

[1] B. Saxberg et al., Rev. Sci. Instrum. 87, 063109 (2016). [2] J. Kiethe et al., Nat. Commun. 8, 15364 (2017). [3] R. Shaniv et al., Phys. Rev. Lett. 120, 103202 (2018).