Accession Number : ADP006729

Title :   An Imaging Method for Non Linear Medium Characteristic Measurements,

Corporate Author : LABORATOIRE DES PROPRIETES OPTIQUES DES MATERIAUX ET APPLICATIONS ANGERS (FRA NCE)

Personal Author(s) : Bouders, G. ; Phu, X. Nguyen ; Lecoq, J. P. ; Sylla, M. ; Rivoire, G.

Report Date : 22 MAY 1992

Pagination or Media Count : 2

Abstract : A non linear medium is placed in the focal plane of a 4f set up. The Fourier spectrum S(u) induces phase and amplitude changes inside the material. Such self induced non linear effects produce two modifications in the image I(x): (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.

Descriptors :   *OPTICAL IMAGES, AMPLITUDE, FOCAL PLANES, IMAGES, INTENSITY, LASERS, MEASUREMENT, PHASE, PULSED LASERS, REFRACTIVE INDEX, SHAPE, VARIATIONS, NONLINEAR OPTICS, CRYSTALS, SYMPOSIA.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE