Abstract
Counterpropagation of two light beams in a resonant medium so dense that the local driving field differs from the external field is considered. It is shown that efficient energy transfer between the two beams occurs if there is some asymmetry between their propagation conditions due to, e.g., their frequency difference or Doppler detuning caused by the motion of the medium. The directional energy flow may predominate over absorption and lead to gain.
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