MUTUAL BEAM RESHAPING BY 2 INTERACTING RADIATION MODES

The steady-state propagation of spatially nonuniform σ+ and σ- beams coupled by means of broadened a homogeneously J = 1/2 ↔ J = 1/2t ransition is shown to give rise in many cases to a spatial separation of the beams. The nature of the nonlinear coupling, which allows the response of one beam to be strongly affected by the presence of the other, and which is the root cause of the phenomenon, is examined in detail. Results for propagation both on and off resonance, with varying initial spatial configurations, demonstrate that the phenomenon of self-induced spatial separation of the copropagating components persists over a wide range of situations. Ap hysical explanation is given in terms of an encoding/diffraction sequence, and the experimental implications are discussed. © 1990, Optical Society of America.