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Self-induced transparency effects are examined in an absorbing medium having degenerate optical transitions. Undistorted propagating light pulses exist under restrictive conditions for j transitions (j>0) and for 0 1 and 1232. Pulses which propagate without energy loss for any transition j^' also include zero-degree pulses defined as (z, t) dt=0.
Rhodes et al. (Mon,) studied this question.