We developed a physical model describing the process of two-wave vectorial mixing in optically active photorefractive crystal of cubic symmetry for an orthogonal scheme of interaction. Using the model, we calculated the two-wave interaction in a photorefractive crystal of bismuth silicate Bi12SiO20 having optical activity. We have determined conditions at that polarization changes don’t influence two-wave mixing. It was found that it is possible to define the parameters of the crystal and interacting waves for the quasi-polarization independence mode, when changes of interferometer output signal caused by polarization instability of the signal wave is reduced to a minimum (no more than 3%). We developed a physical model describing vectorial two-wave mixing in optically active, cubic-symmetry photorefractive crystals for an orthogonal interaction geometry. We apply the model to bismuth silicate (Bi12SiO20), an optically active photorefractive crystal. We further show that by appropriately selecting crystal and wave parameters, a quasi-polarization-independent regime can be achieved, in which interferometer output fluctuations caused by signal-wave polarization instability are minimized to no more than 3%.
Bezruk et al. (Wed,) studied this question.