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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster VII
Q 56.34: Poster
Donnerstag, 14. März 2024, 17:00–19:00, KG I Foyer
Recent progress on PTB’s transportable Al+ ion clock — •Constantin Nauk1, Benjamin Kraus1, Joost Hinrichs1,2, Gayatri Sasidharan1, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, Institut für Quantenoptik, 30167 Hannover, Germany
Optical atomic clocks demonstrate remarkable fractional systematic and statistical frequency uncertainties on the order of 10−18, opening the door to novel applications. One such application are height measurements in relativistic geodesy at the cm level. However, earth monitoring field campaigns require robust, reliable and transportable hardware.
For this purpose, we are currently setting up a clock based on the 1S0 → 3P0 transition in 27Al+. A co-trapped 40Ca+ ion allows state detection and cooling through quantum logic spectroscopy and sympathetic cooling.
We present the 19" rack design and the current status of the transportable apparatus. The physics package, including the vacuum system designed for pressure ranges below 10−10 mbar, and the surrounding optics are discussed. Notably, we present a combining laser setup that combines laser light for ionization, cooling, state read-out and repumping into one fiber. Additionally, we showcase the performance of the cavity-stabilized clock light fundamental laser with a fractional frequency instability of about 2 · 10−16 at 1 second.
Keywords: high-accuracy; optical clock; stable UV light; transportability; vacuum