Abstract
Optical interferometry using photorefractive two-wave mixing has been proposed for the detection of small amplitude vibration. Sensitivity in this interferometry depends on spatial phase difference between the interference fringe and the refractive index grating due to the photorefractive effect. It is proposed to realize vibration detection in such a way that the moving grating technique is applied to the photorefractive two-wave mixing. For this purpose, the optimum speed of movement is discussed. On the basis of the Kogelnik's theory, a theoretical equation is derived about the interference beam which is equivalent to an output signal. Although this is simple approach, our theoretical equation is available for practical use in vibration detection using photorefractive two-wave mixing.
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