Abstract
We propose a novel approach to visualize the light-induced refractiveindex changes in photorefractive crystals employing digital holography.The holograms formed in a Mach-Zehnder interferometer are recorded by atwo-dimensional CCD camera. From these holograms, the phasedifferences, which contain the information of the index changes inphotorefractive crystals, are determined by utilizing digitalholographic interferometry. Then the two-dimensional visualizations ofindex changes in the crystals can be obtained. This method issuccessfully demonstrated in LiNbO3:Fe, KNSBN:Ce and SBN:Crcrystals.
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