Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 48: Poster – Quantum Optics, Technologies, and Optomechanics

Q 48.38: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Industrial clock laser system for quantum applications with fractional frequency instability below 6E-16 at 1 s — •Dewni Pathegama, Filippo Bregolin, and Florian Schäfer — TOPTICA Photonics AG, Lochhamer Schlag 19, 82166, Graefelfing (Munich), Germany

In recent years, there has been an increasing demand for industries to provide compact laser systems with robust design and minimal operational oversight. For quantum computing and optical clocks, coherence times of up to one second are required, corresponding to a fractional frequency instability below 2E-15 for averaging times between 0.1 s and 100 s.

Here we present the latest results from TOPTICA transportable, rack mounted ultra-stable clock laser system. We confirm that our laser system meets these criteria by comparing it against two reference lasers via an optical frequency comb and a frequency counter. We measure an absolute fractional frequency instability of 6E-16 between 0.1 s and 10 s averaging time (modified Allan deviation, lambda counting, 10 ms gate time), and a linear drift of < 150 mHz/s over two days. For averaging times below 10 ms (shorter than the minimum gate time of the counter), we use delayed self-heterodyne method.

To understand the physical limits of the system, we characterise the effect of seismic and acoustic vibrations, optical power fluctuations, and fiber noise on the instability. In conclusion, we confirm that our clock laser system is a suitable system for quantum applications in the field that is reliably reproducible.

Keywords: industrial laser; clock laser; optical clock; Allan deviation; stability