Bonn 2025 – scientific programme

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A: Fachverband Atomphysik

A 11: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)

A 11.28: Poster

Tuesday, March 11, 2025, 14:00–16:00, Tent

Trapping and interfacing laser-cooled strontium atoms using an optical nanofibre — •Luca Göcke, Hector Letellier, Philipp Schneeweiss, Jürgen Volz, and Arno Rauschenbeutel — Department of Physics, Humboldt-Universität zu Berlin, Germany

We are in the process of building an experimental setup for trapping and optically interfacing laser-cooled strontium atoms using the evanescent field surrounding an optical nanofibre. The nanofibre is produced from a standard step-index optical fibre in a heat-pull process. It features a waist diameter of 200 nm where light is still efficiently guided while a significant part of the light propagates in the form of an evanescent field surrounding the nanofiber. Atoms are trapped in a one-dimensional (1D) optical lattice formed by two fiber-guided light-fields, red- and blue-detuned with respect to the strong transition at a wavelength of 461 nm. The aim is to realize a compensated trap, where the wavelengths of the trapping fields are magic for the 7.4 kHz wide intercombination line at 689 nm. This will allow us to implement advanced schemes for loading single atoms into the 1D optical lattice and to investigate the phenomenon of selective radiance [1], where the atoms themselves act as the waveguide. Here we will present our compact design for trapping strontium atoms from a laser ablated source with a “hot MOT” (operated at 461 nm wavelength), then transfer them to a “cold MOT” (operated at the intercombination line) and to the nanofibre trap.

[1]: A. Asenjo-Garcia et al. PRX 7, 031024 (2017)

Keywords: Strontium; Nanofiber; Collective Effects