Shifting the phase of a coherent beam with a 174Yb+ ion: influence of the scattering cross section

We discuss and measure the phase shift imposed onto a radially polarized light beam when focusing it onto an 174 Yb + ion. In the derivation of the expected phase shifts, we include the properties of the involved atomic levels. Furthermore, we emphasize the importance of the scattering cross section...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2017, Vol.123 (1)
Main Authors: Fischer, Martin, Srivathsan, Bharath, Alber, Lucas, Weber, Markus, Sondermann, Markus, Leuchs, Gerd
Format: Article
Language:English
Subjects:
Engineering
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
“Enlightening the World with the Laser” - Honoring T. W. Hänsch
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Summary:We discuss and measure the phase shift imposed onto a radially polarized light beam when focusing it onto an 174 Yb + ion. In the derivation of the expected phase shifts, we include the properties of the involved atomic levels. Furthermore, we emphasize the importance of the scattering cross section and its relation to the efficiency for coupling the focused light to an atom. The phase shifts found in the experiment are compatible with the expected ones when accounting for known deficiencies of the focusing optics and the motion of the trapped ion at the Doppler limit of laser cooling (Hänsch and Schawlow in Opt Commun 13:68–69, 1975 ).
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-016-6609-3