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Q: Fachverband Quantenoptik und Photonik
Q 37: Poster III
Q 37.1: Poster
Mittwoch, 13. März 2024, 17:00–19:00, Tent B
A cryo-compatible, high-finesse all-fibre microcavity for REI spectroscopy — •Nicholas Jobbitt1,4, Jannis Hessenauer1,4, Evgenij Vasilenko2,4, Vishnu Unni C.1,4, Barbora Brachnakova3,4, Senthil Kuppusamy2,3,4, Mario Ruben2,3,4, and David Hunger2,3,4 — 1Physikalisches Institut — 2Institut für Quanten Materialien und Technologien — 3Institute of Nanotechnology — 4Karlsruher Institut für Technologie, Karlsruhe, Germany
Quantum technologies promise to enhance our current classical computing and communication infrastructure. Rare-earth ion (REI) based solid-state systems are ideal for this purpose due to the exceptional optical (4 ms) and spin (6 h) coherence times of their 4f → 4f transitions. However, key obstacles encountered while developing an efficient light-matter interface for quantum technologies using REI based solid-state systems are their long optical lifetimes (T1,opt ∼ms) and low branching ratios (<1%). Both these obstacles can be remedied by the integration of such systems into Fabry-Pérot microcavities. Here we present the development and testing of a cryo-compatible, high-finesse all-fibre microcavity designed for the purpose of REI spectroscopy. The cavity is largely monolithic in design with a single controllable degree of freedom, which reduces the mechanical noise present in the system (rms = 430 fm at cryogenic temperatures) and therefore allows us to maximise the Purcell-factor. Additionally, high quality (rms ∼1 nm) Eu3+ based crystalline organic molecules have been grown onto fibre-end facets, suitable for integration into the cavity.
Keywords: Rare-earth ions; Fabry-Pérot microcavities; Spectroscopy