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Q: Fachverband Quantenoptik und Photonik
Q 53: SYCM: Contributed posters for the Symposium Hot topics in cold molecules: From laser cooling to quantum resonances
Q 53.2: Poster
Donnerstag, 12. März 2020, 16:30–18:30, Empore Lichthof
A buffer gas beam of AlF molecules and optical cycling — •Simon Hofsäss1, Maximilian Doppelbauer1, Sebastian Kray1, Jesùs Pérez-Ríos1, Boris Sartakov2, Gerard Meijer1, and Stefan Truppe1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2General Physics Institute, Russian Academy of Sciences, Moscow, Russia
We have recently identified the aluminium monofluoride (AlF) molecule as an excellent candidate for laser cooling and trapping at high densities and measured the detailed energy level structure of the electronic states relevant for these processes[1].
The first excited singlet state lifetime of 1.9 ns and the large photon recoil allow exerting a large cooling force to slow the molecules. The hyperfine structure in the excited state of the main cooling transition covers about 500 MHz, which allows slowing without chirping the laser frequency. The short excited state lifetime leads also to an exceptionally large capture velocity of a magneto optical trap, which is only limited by the available laser power in the UV.
Here we present the characterization of a cryogenic buffer gas molecular beam of AlF that will be used to load a magneto optical trap (MOT). Absorption and laser-induced fluorescence spectroscopy are used to determine the molecular flux. The velocity distribution is measured by combining optical pumping with a long time-of-flight. We investigate optical cycling and compare the measurements to a theoretical model.
[1] Truppe et al., Phys. Rev. A 100, 052513 (2019)