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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 5: Optical Methods

K 5.3: Vortrag

Donnerstag, 5. März 2026, 11:45–12:00, HS 20

Comparing clocks: from time interval counting to timetagging — •Tizian Schmidt and Ilja Gerhardt — Institute of Solid State Physics, light & matter group, Leibniz Universität Hannover

Precise timing plays a crucial role in many areas of physics. Comparing ultra stable clocks is particularly challenging when the composite noise of the compared clocks is lower than the noise of the measurement system such as a conventional time interval counter.

The Dual Mixer Time Difference (DMTD) method overcomes this limitation by enabling a measurement of the relative phase and frequency differences between two such clocks without relying on a superior measurement system. Here, we present a setup based on digital post-processing of the DMTD signals using a commercially available timetagging device, negating the need for custom built electronic hardware. The setup is suitable for laboratory experiments as well as undergraduate lab courses. The resulting Allan deviations for the measured atomic clocks are compared to other standard time measurement techniques to compare clocks.

Keywords: Dual mixer time difference; Atomic clock; Allan Deviation