B. Rohricht et al., NONLINEAR BEHAVIOR OF CIRCULARLY POLARIZED LASER-BEAMS PROPAGATING THROUGH SODIUM VAPOR, Zeitschrift fur Naturforschung. A, A journal of physical sciences, 48(5-6), 1993, pp. 621-623
A variety of surprising effects arise from the nonlinear light-matter
interaction of circularly polarized laser light propagating through so
dium vapor. We present experimental evidence for an asymmetry in the a
bsorption of left hand and right hand circularly polarized light as we
ll as for the creation of a collimated light beam of apposite polariza
tion within the light-matter interaction region. Both effects are not
yet explained by common theories.