SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Precision Measurements
Q 7.7: Poster
Dienstag, 21. September 2021, 16:30–18:30, P
Highly stable UV laser system for a transportable Al+ quantum logic optical clock — •Benjamin Kraus1,2, Stephan Hannig1,2, Sofia Herbers1,2, Dewni Pathegama1, Fabian Dawel1, Johannes Kramer1, Constantin Nauk1,2, Christian Lisdat1, and Piet O. Schmidt1,2,3 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2DLR-Institute for Satellite Geodesy and Inertial Sensing, 30167 Hannover, Germany — 3Leibniz Universität Hannover, 30167 Hannover, Germany
Optical atomic clocks provide the most precise frequency standards. They enable high accuracy tests of fundamental physics, relativistic geodesy, and a possible future redefinition of the SI second. For side-by-side clock comparisons, highly accurate transportable optical clocks are necessary.
We report on our newly built clock laser system for a transportable Al+ clock with its clock transition at 267.4 nm. The system consists of the laser source at 1069.6 nm, a highly stable optical reference cavity, a frequency quadrupling system, and the electronic control system all built in one rack. In particular we highlight the frequency quadrupling system consisting of two cascaded single-pass second harmonic generation(SHG) stages. The set-up is interferometrically phase-stabilized and built inside a hermetically sealed aluminium box to form a robust, compact, and stable fibre-coupled module. Additionally, a robust fibre-coupled single-pass acousto-optical modulator module at 267.4 nm for frequency shifting or switching the laser light is presented.