Trans-spectral orbital angular momentum transfer via four-wave mixing in Rb vapor

Walker, G., Arnold, A.S. and Franke-Arnold, S. (2012) Trans-spectral orbital angular momentum transfer via four-wave mixing in Rb vapor. Physical Review Letters, 108(24), Art. 243601. (doi:10.1103/PhysRevLett.108.243601)

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Abstract

We report the transfer of phase structure and, in particular, of orbital angular momentum from near-infrared pump light to blue light generated in a four-wave-mixing process in 85Rb vapor. The intensity and phase profile of the two pump lasers at 780 and 776 nm, shaped by a spatial light modulator, influences the phase and intensity profile of light at 420 nm, which is generated in a subsequent coherent cascade. In particular, we observe that the phase profile associated with orbital angular momentum is transferred entirely from the pump light to the blue. Pumping with more complicated light profiles results in the excitation of spatial modes in the blue that depend strongly on phase matching, thus demonstrating the parametric nature of the mode transfer. These results have implications on the inscription and storage of phase information in atomic gases.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Franke-Arnold, Dr Sonja
Authors: Walker, G., Arnold, A.S., and Franke-Arnold, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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