Abstract
The modulation of a photorefractive index grating, ?n, can be estimated by counting the number of peaks in the curve for the diffraction efficiency as a function of time under the phase matching condition. The accuracy for this method is about 13%. Here a new method is proposed, in which we improve the measurement accuracy to about 1%, by adding the measurement for the diffraction efficiency as a function of the angle mismatch. This precise ?n measurement allows us to quantify photorefractive effects with greater accuracy.
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