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Phase coherent link between ISI and BEV
Čížek, Martin ; Pravdová, Lenka ; Hrabina, Jan ; Lazar, Josef ; Číp, Ondřej ; Havliš, O. ; Altmannová, L. ; Smotlacha, V. ; Vojtěch, J. ; Pronebner, T. ; Aeikens, E. ; Premper, J. ; Mache, W. ; Niessner, A. ; Schumm, T.
The paper deals with the current state and the first experiments performed on a 232 km long cross-border phase-coherent line between ISI in Brno and BEV in Vienna. This line is the first operational segment of the planned network for mutual comparison of different types of optical atomic clocks between ISI (Ca +), BEV (Cs) and Atominstitut (Thorium) in Vienna. At all workplaces, local highly coherent lasers (spectral line width in the order of Hz or better) will be synchronized with the link output. This network of synchronized lasers will serve as a transfer medium for the mutual comparison of optical atomic clocks in individual laboratories.
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SMV-2020-55: ADJ3 standard
Hrabina, Jan ; Jelínek, Michal ; Čížek, Martin ; Číp, Ondřej
The contractual research was oriented towards works on ADJ3-CESNET laser standard:\n- analysis and measurement of actual parameters of the system \n- reduction of electric noise (control system) \n- optical polarization stabilization (beat-note measurements) \n- upgrading of control SW \n- PID control optimalization, verification tests of the system
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