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Q: Fachverband Quantenoptik und Photonik

Q 70: Quantum Optics

Q 70.2: Talk

Friday, March 15, 2024, 14:45–15:00, HS 3118

Degenerate Cavity for Dispersive Imaging of Ultracold Atoms — •Oliver Lueghamer¹, Thomas Juffmann^2,3, and Maximilian Prüfer¹ — ¹Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien — ²University of Vienna, Faculty of Physics, VCQ — ³University of Vienna, Max Perutz Laboratories, Department of Structural and Computational Biology

Dispersive imaging is routinely used in cold atom experiments. However the quantum limited operation is still a challenge. We present an approach using a degenerate cavity, which allows the probe beam to pass the sample multiple times. Degenerate cavities were already used in quantum microscopy to surpass the shot noise limit without the use of delicate quantum states. For this mostly biological investigations, a pulsed laser operation was employed. Only recently continuous wave applications were implemented experimentally.

We develop and test such a degenerate cavity setup for the potential use in a consisting atom chip experiment. We are able to show a signal to noise ratio (SNR) enhancement for large biological samples (e.g. epithelial cells of a human cheek). We investigate the possibility of quickly driving the input mirror over the free spectral range to have enhancement without stabilizing the cavity. We conclude by giving an outlook on the possibility to use this technique for ultracold atom experiments.

Keywords: Imaging of ultracold atoms; Optical cavity