Abstract
We present consistent theoretical studies of the optically heterodyned polarization interferometry (OHPI) with collinear circularly and linearly polarized interacting beams in the framework of the 3rd-order nonlinear susceptibility. A new method for measuring the phase of the nondegenerate susceptibility that is based on the dependence on the pump beam intensity in the standard OHPI scheme is proposed. The conditions for observing the signals which are purely due to linear or circular light-induced dichroism and birefringence are discussed and new experimental arrangements are suggested. Further, the optimum sample length to detect the OHPI signal is derived. The line shape of the OHPI signal and the elimination of the broad background in nonlinear polarization spectrposcopy are also discussed.
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