SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Precision Measurements
Q 7.9: Poster
Dienstag, 21. September 2021, 16:30–18:30, P
An ultra-stable clock laser system for an Al+ ion clock — •Dewni Pathegama1, Sofia Herbers1,2, Eileen Annika klocke1,3, Stephan Hannig1,2, Benjamin Kraus1,2, Piet O. Schmidt1,2,4, Uwe Sterr1, and Christian Lisdat1 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2DLR-Institute for Satellite Geodesy and Inertial Sensing, Hannover, Germany — 3currently with Askion GmbH, Gera, Germany — 4Leibniz University of Hannover, Hannover, Germany
Transportable optical clocks are increasingly used in applications like relativistic geodesy. One of the key components of an optical clock is an ultra-stable interrogation laser, whose instability affects the clock performance via the Dick effect.
Here we present a clock laser system designed for a transportable Al+ clock [Hannig et al., Rev. Sci. Instrum. 90, 053204 (2019)]. The system consists of a DFB fiber laser locked to a cavity with crystalline mirror coatings [Cole et al., Nat. Phot. 7, 644 (2013)] to reduce the thermal noise contribution of the cavity below 10−16 fractional frequency instability. Additionally, suppression of residual amplitude modulation (RAM), power stabilization of the light oscillating in the cavity, and temperature stabilization of the cavity will be employed to reach an instability as low as 10−16. The laser is operated at 1069.6 nm, and fourth harmonic generation is implemented to reach the 267.4 nm interrogation wavelength of Al+. All the components including the cavity and electronics are designed to be installed inside a single rack.