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A theoretical study of the rotational dynamics of a linear polar molecule ina two-color non-resonant cw laser field is presented. By systematicallyconsidering the interactions of this field with the electric dipole moment,polarizability and hyperpolarizability of the molecule, the effect of thesymmetries of the Hamiltonian on the orientation and alignment is explored in aregime where the time-average approximation does not hold. It is shown that thealignment and orientation satisfy certain symmetries as a function of thephases and field strengths. On average a one-color cw laser field doest notorient the molecule, being necessary a two-color one having odd and evenproducts of the laser frequency to break the head-versus-tail orderconfinement.

A linear polar molecule in a two-color cw laser field: a symmetry analysis