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We consider propagation, storing and retrieval of slow light (probe beam) ina resonant atomic medium illuminated by two control laser beams of largerintensity. The probe and two control beams act on atoms in a tripodconfiguration of the light-matter coupling. The first control beam is allowedto have an orbital angular momentum (OAM). Application of the secondvortex-free control laser ensures the adiabatic (lossles) propagation of theprobe beam at the vortex core where the intensity of the first control lasergoes to zero. Storing and release of the probe beam is accomplished byswitching off and on the control laser beams leading to the transfer of theoptical vortex from the first control beam to the regenerated probe field. Apart of the stored probe beam remains frozen in the medium in the form ofatomic spin excitations, the number of which increases with increasing theintensity of the second control laser. We analyse such losses in theregenerated probe beam and provide conditions for the optical vortex of thecontrol beam to be transferred efficiently to the restored probe beam.

Optical vortices of slow light using tripod scheme