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

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