The cell-exit transverse profile for one-way propagation through sodium vapor forms a pattern of spots with complexity and beauty rivaling that of a kaleidoscope. These patterns are stationary in time, reproduce completely when the power or frequency is scanned, and agree well with one-way computations that show that the patterns change very little after one-fifth of the propagation distance, i.e., they exhibit the properties of bifurcations of transverse solitary waves.
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Grantham et al. (1991) studied this question.
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