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A: Fachverband Atomphysik

A 23: Trapped ions

A 23.5: Vortrag

Mittwoch, 8. März 2017, 15:45–16:00, N 3

Photoexcitation of atoms by Laguerre-Gaussian beams — •Anton Peshkov¹, Daniel Seipt^2,3, Andrey Surzhykov^4,5, and Stephan Fritzsche^1,3 — ¹Helmholtz-Institut Jena, Germany — ²Lancaster University, United Kingdom — ³Friedrich-Schiller-Universität Jena, Germany — ⁴Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — ⁵Technische Universität Braunschweig, Germany

With the recent experimental advances in optics, it is possible to produce Laguerre-Gaussian (LG) light beams with a non-zero projection of the orbital angular momentum (OAM). During the last few years, it was shown that the OAM may affect the fundamental light-matter interaction processes. In a recent experiment, in particular, it was demonstrated for an atom placed on the axis of the incident LG light beam that the sublevel population of excited atomic states is determined by the beam’s OAM [1]. Following this experiment, we investigate theoretically the sublevel population of atoms with an arbitrary position with regard to the axis of the beam. We show that the sublevel population may vary significantly when the atoms are moved away from the beam axis. The population of the excited atoms is also found sensitive to the polarization, radial index, as well as the OAM of the incident LG beam; these effects can be observed experimentally by measuring the angular distribution of the subsequent fluorescence radiation.

[1] C. T. Schmiegelow et al., Nat. Commun. 7, 12998 (2016).

[2] A. A. Peshkov et al., Phys. Scr. 91, 064001 (2016).