3 papers
physics.optics2026
Optical steering of a large ring laser
Jannik Zenner, Karl Ulrich Schreiber, Simon Stellmer
A common approach to reduce the linewidth of a laser is an increase of its resonator length. In large gas lasers, however, the frequency spacing between longitudinal modes of the r…
physics.optics2025
Hänsch-Couillaud locking of a large Sagnac interferometer: advancing below the flicker floor
Jannik Zenner, Karl Ulrich Schreiber, Simon Stellmer
Large Sagnac interferometers in the form of active ring lasers have emerged as unique rotation sensors in the geosciences, where their sensitivity allows to detect geodetic and sei…
physics.optics2024
Stabilizing the free spectral range of a large ring laser
Jannik Zenner, Karl Ulrich Schreiber, Simon Stellmer
A ring laser is defined by its perimeter, which directly enters the conversion factor between measured Sagnac frequency and the actual rotation rate. Large ring lasers employed in…