“…We have also derived the expressions for the two-beam coupling gain (i.e., gain factor) and photorefractive phase-shifts for the signal beam under the appropriate boundary conditions of the ring resonators. In the earlier published literatures [5,9,11,20,25,29], the influences of the photoconductivity and dielectric constant of photorefractive materials on the amplification of the two-wave mixing gain factor and photorefractive phase-shifts of the signal beam inside a single unidirectional ring resonator have not been explored in detail. In this paper, the above effects are considered in details and discussed on its performances.…”