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Nonlinearity enhancement in rubidium vapor with vectorial mechanism

We consider the optical nonlinearity enhancement, which is obtained for rubidium vapor by using beams with mutually orthogonal polarizations. The simple three-level model and numerical estimations for a full transition model are reported. Different from the traditional Kerr nonlinearity, the vectorial mechanism nonlinearity strength diminishes for higher intensities, as well as for low ones, and optimal intensity level exists.