Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Precision Measurements and Metrology III

Q 54.7: Talk

Thursday, March 14, 2019, 15:45–16:00, S SR 111 Maschb.

Suppression of the AC-Stark shift by vortex light beams — •Sabrina A.-L. Schulz^1,2 and Andrey Surzhykov^1,2 — ¹Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — ²Technische Universität Braunschweig, Germany

Since the groundbreaking work of Allen et al. in 1992 [1], the interest in twisted light has grown steadily both in experiment and theory. Twisted light beams carry a non-zero projection of orbital angular momentum (OAM) onto their propagation direction, have a helical phase front and an intensity minimum in the beam center [2].

Atoms located in this minimum experience a reduced AC-Stark shift [3] and, therefore, twisted beams may considered as valuable tool to drive atomic clock transitions. In this contribution, particular emphasis is paid to the electric-octupole (E3) transition ²S_1/2 →²F_7/2 in the ¹⁷¹Yb⁺ ion. To investigate the dependence of the AC-Stark shift in this ion on the parameters of the (twisted) light beam, we used the relativistic Dirac quantum theory and the density matrix formalism. Based on this theory, detailed calculations were done for the E3 atomic clock transition and these results may be implemented in the ¹⁷¹Yb⁺ single-ion clock experiments at PTB [4].

[1] L. Allen, et al. Phys. Rev. A 45, 8185 (1992)

[2] H. M. Scholz-Marggraf, et al. Phys. Rev. A 90, 013425 (2014)

[3] C. T. Schmiegelow, et al. Nature Communications 7 12998 (2016)

[4] N. Huntemann, et al. Phys. Rev. Lett. 116, 063001 (2016)