A variety of surprising effects arise from the nonlinear light-matter interaction of circularly polarized laser light propagating through sodium vapor. We present experimental evidence for an asymmetry in the absorption of left hand and right hand circularly polarized light as well as for the creation of a collimated light beam of apposite polarization within the light-matter interaction region. Both effects are not yet explained by common theories.
Symbolic-dynamical encoding of chaotic dynamics yields a precise quantitative characterization of the temporal scaling behavior at crisis points. A complete analysis in the heteroclinic tangency case is presented for an NMR-laser