An Imaging Method for Non Linear Medium Characteristic Measurements,
LABORATOIRE DES PROPRIETES OPTIQUES DES MATERIAUX ET APPLICATIONS ANGERS (FRA NCE)
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A non linear medium is placed in the focal plane of a 4f set up. The Fourier spectrum Su induces phase and amplitude changes inside the material. Such self induced non linear effects produce two modifications in the image Ix 1 intensity variation due to non linear absorption, 2 shape changes due to non linear refractive index variation. The study of these modifications allows the measurement of the non linear material characteristics. This method is used to study photorefractive materials excited either with CW or with pulsed laser.