Demonstration of a Transportable 1 Hz-Linewidth Laser
Stefan Vogt, Christian Lisdat, Thomas Legero, Uwe Sterr, Ingo, Ernsting, Alexander Nevsky, Stephan Schiller

TL;DR
This paper demonstrates a transportable 1 Hz-linewidth laser system for atomic clocks, showing it maintains performance after transportation over 400 km, enabling portable high-precision timekeeping.
Contribution
It introduces a transportable, cavity-stabilized laser system with verified stability after long-distance transport, suitable for portable atomic clock applications.
Findings
Laser linewidth below 1 Hz maintained after transport
Transport did not degrade laser performance
Successful comparison with stationary clock laser
Abstract
We present the setup and test of a transportable clock laser at 698 nm for a strontium lattice clock. A master-slave diode laser system is stabilized to a rigidly mounted optical reference cavity. The setup was transported by truck over 400 km from Braunschweig to D\"usseldorf, where the cavity-stabilized laser was compared to a stationary clock laser for the interrogation of ytterbium (578 nm). Only minor realignments were necessary after the transport. The lasers were compared by a Ti:Sapphire frequency comb used as a transfer oscillator. The thus generated virtual beat showed a combined linewidth below 1 Hz (at 1156 nm). The transport back to Braunschweig did not degrade the laser performance, as was shown by interrogating the strontium clock transition.
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