The following researchers are funded in the RING Project by the German Research Foundation
Dr.-Ing. Mingyue Zhang is a postdoctoral researcher at the Institute of Geodesy (IfE), Leibniz University Hannover. She completed her doctoral studies at Leibniz University Hannover. Her research has focused on Lunar Laser Ranging (LLR) as a tool for Earth–Moon system dynamics, geodetic parameter determination, relativistic tests, and lunar time-scale modelling. Relevant work included tests of the equivalence principle and investigations of other relativistic effects using LLR, including a possible temporal variation of the gravitational constant. Her doctoral research concerned an advanced LLR technique, Differential Lunar Laser Ranging (DLLR), with emphasis on its characteristics and its combination with standard LLR for improved parameter estimation. More recently, her research has extended to the determination of Earth orientation parameters from LLR observations and to accurate modelling of clock frequency comparison between the Earth and the Moon. The work demonstrates the potential role of LLR for fundamental physics as well as for future lunar time-scale and lunar navigation applications that all will now be enhanced by RING project P4.
Jannik Zenner studied at RWTH Aachen and joined the Quantum Metrology research group in 2023. Together with Ulli Scheiber and Andreas Brotzer, he installed the 4-meter GeoRG ring laser, which is based on the GeoSensor design, in the basement of the Physics Institute. He has developed and implemented a range of technological advances, including the stabilization of the scale factor and the passive operation using the Hänsch-Couillaud and Pound-Drever-Hall locking methods. Importantly, he can operate the GeoRG ring laser in hybrid (active and passive) mode, making is a worldwide unique platform for technology development. He is working in RING project P1.
Thomas Gereons studies at the University of Bonn and joined the ring laser community in late 2024: first as an internship, then for a master thesis, and currently as a PhD student. Thomas has developed the world’s first three dimensional array of passive ring laser gyroscopes that allows for a full reconstruction of the rotation vector, and is currently optimizing the sensor for sensitivity and stability. He will contribute to the development of transportable sensors in P2, aiming for seismological measurements at observatories outside the quantum optics lab. Together with Jannik and Ulli, he upgraded the C-II ring in Christchurch for passive operation. He is working in RING project P2.
