Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 51: Poster: Quantum Optics and Photonics IV

Q 51.57: Poster

Wednesday, March 7, 2018, 16:15–18:15, Redoutensaal

Characterization of Optically Dense Atomic Ensembles confined in Nanofiber-based traps — •Samuel Rind, Adarsh Prasad, Jakob Hinney, Christoph Clausen, Jürgen Volz, Philipp Schneewiess, and Arno Rauschenbeutel — srind@tuwien.ac.at

Nanofiber based traps have been used for the last decade as novel interface between light and matter. Here we realize an efficient optical interface between fiber-guided light and laser-cooled atoms, which are arranged in two linear arrays in a two-color evanescent-field dipole trap around an optical nanofiber. In this configuration, we achieve a strong light-matter interaction where the probability of a nanofiber-guided photon being absorbed by a trapped atom is as high as 10%. To see this, we measure the transmission through the fiber as we scan the frequency of our probe field. When large ensembles of atoms are trapped (several 1000) this gives rise to a high optical density (OD) around the fiber. As a consequence, even for large detuning (>100MHz) from the atomic resonance the atoms completely scatter light. This makes accurate and quick measurements of OD difficult with standard instruments, such as an acousto-optic modulator (AOM), which typically have frequency scan ranges below 200MHz. Here, we implement an electro-optic modulator (EOM) based frequency scanning scheme that allows us to scan a range that exceeds 1GHz in our experimental time frame of 5ms easily. This enables us to measure OD well over 1000, vastly improving previous incarnations we had of OD measurement schemes.