Erlangen 2026 – wissenschaftliches Programm

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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 12: Relativistic Astrophysics III / Gravitational waves III

GR 12.4: Vortrag

Donnerstag, 19. März 2026, 14:30–14:45, KH 01.016

Fibre-based Phase Camera for the Einstein Telescope — •Stuti Sharma, Benjamin Schwab, Adrian Zink, and Stefan Funk for the Einstein Telescope collaboration — Erlangen Centre for Astroparticle Physics (ECAP), Friedrich-Alexander University

The Einstein Telescope (ET) is a planned third-generation underground gravitational wave observatory. The telescope requires precise monitoring of optical wavefront quality. Mode mismatches and wavefront aberrations in the sidebands used for interferometer control can lead to the excitation of higher order Gaussian modes (HOMs) which reduce detector performance. To address this, a fibre-based 56-pixel proof-of-concept phase camera has been developed. This camera is capable of simultaneously measuring the spatial amplitude and phase of multiple sidebands. Its multimode fibre array provides stable spatial phase relations between pixels at high frame rates. A dedicated digitisation setup is built via the CTC ASIC, that has been adopted from camera readout electronics for CTAO. Commissioning of such a setup at the ET Pathfinder demonstrated reliable visualisation of wavefronts and identification of HOMs.

Future work will build on enhancing the analysis of phase camera images to distinguish and classify higher order Gaussian modes. Therefore, an optical resonator capable of generating arbitrary, well-defined higher-order mode content will be added to the setup for future wavefront studies. The system will be scaled toward a 4096-pixel camera with FPGA based real-time demodulation. These developments aim to establish a robust and scalable wavefront sensing framework for ET.

Keywords: Einstein Telescope; Gravitational Waves; Laser; Fibre-based camera; CTAO