During his PhD studies, Rasmus Malthe Fiil Andersen investigated the spectral features of ultra-cold gases, specifically Bose-Einstein condensates. It was found that useful information was possible to extract from such spectra using non-destructive probe light and the dark-field technique. This opens up new possibilities for precision measurements in the field of ultra-cold atoms, such as sensitive detection schemes of complex many-particle physics.
The newly gained knowledge will be a useful tool for upcoming research and will serve as an indispensable stepping stone for future experiments in the group.

The PhD study was completed at Department of Physics and Astronomy, Faculty of Natural Sciences, Aarhus University.

This summary was prepared by the PhD student.

Time: Wednesday 5 November 2025 at 12:30
Place: 1526-626, Det Skæve Rum, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C
Title of PhD thesis: Spectrally Probing Ultra-Cold Bosonic Clouds
Contact information: Rasmus Malthe Fiil Andersen, e-mail: rmfa@phys.au.dk, tel.: +45 22410321
Members of the assessment committee:
Associate Professor, David Clément, Institut d'Optique Graduate School, France
Associate Professor, Patrick Windpassinger, Johannes Gutenberg University Mainz, Germany
Associate Professor, Karsten Riisager (chair), Department of Physics and Astronomy, Aarhus University, Denmark
Main supervisor: Associate Professor, Jan Joachim Arlt, Department of Physics and Astronomy, Aarhus University, Denmark
Language: The PhD dissertation will be defended in English

The defense is public.
The PhD thesis is available for reading at the Graduate School of Natural Sciences/GSNS, Ny Munkegade 120, building 1521, 8000 Aarhus C