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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:46 |
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Conference: Bucharest University Faculty of Physics 2024 Meeting
Section: Theoretical and Computational Physics, High-Energy Physics, Applied Mathematics
Title:
Interaction of atomic systems with helical beams
Authors:
Andrei Constantin(1), Madalina Boca(1)
Affiliation:
(1)University of Bucharest, Departament of physics
E-mail
andrei.constantin3@s.unibuc.ro
Keywords:
helical beams, orbital angular momentum, bound-bound transitions
Abstract:
We present a study of the interaction of helical modes of the electromagnetic field with hydrogen-like atoms. Helical modes of the electromagnetic field [1] are particular solutions of the Maxwell equations, carrying orbital angular momentum (OAM). After the publication of the theoretical paper of Allen, OAM carrying laser fields were demonstrated experimentally and currently are used in many applications.
In our work we compared two theoretical descriptions presented in the literature for helical beams: Bessel (B) and Laguerre-Gauss (LG). For each, we studied the spatial distribution of the intensity in its dependence on the beam parameters, and then calculated the bound-bound transition probability of a hydrogen-like atom interacting with such a field. We present numerical results for the transition cross section corresponding to (B), respectively (LG) beams for different parameters and asses the possibility to observe in an experiment the difference between the two cases.
References:
[1] L. Allen et al, Phys. Rev. A 45, 8185 (1992)
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