Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Poster: Quantum Optics and Photonics I
Q 24.12: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik
Transverse-mode coupling artefacts in scanning cavity microscopy — •Julia Benedikter1,2, Matthias Mader1,3, Theodor W. Hänsch1,3, and David Hunger2 — 1Ludwig-Maximilians-Universität München — 2Karlsruher Institut für Technologie — 3Max-Planck-Institut für Quantenoptik, Garching
Scanning fibre cavities combine an enhanced light matter interaction with high resolution imaging in an open access environment. Due to the deviations of the fibre mirror profile from a sphere, transverse mode coupling can occur when the resonance condition is simultaneously met for several transverse modes, leading to additional losses. When laterally scanning the plane mirror through the cavity mode, one observes distinct ring shaped mode coupling artefacts as well as background patterns with features smaller than the diffraction limit. We show in detailed scanning cavity transmission measurements that the structures are isocontours of a varying penetration depth into the mirror coating and therefore a sensitive probe of the mirror properties. We examine the typical checker-board background pattern and find that it is also a mode coupling effect and can be attributed to the mirror roughness.