Accession Number : ADP008614

Title :   Huge Optical Amplification by Applying Pulsed Electric Fields to Photorefractive Crystals,

Corporate Author : CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ORSAY (FRANCE)

Personal Author(s) : Mathey, P. ; Pauliat, G. ; Launay, J. C. ; Roosen, G.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : A large number of proposed or demonstrated architectures for optical computing takes advantage of the unique properties of photorefractive crystals. Efficient operation requires large optical nonlinearities. BaTiO3 exhibits these strong refractive index changes due to its large electro-optic coefficient. Unfortunately it has a low sensitivity and this a slow response time. BSO is much more sensitive but its electro-optic coefficient is smaller. It is consequently necessary to induce large internal electric fields. Different methods were already proposed and demonstrated to enhance the space charge field in photorefractive crystals: (1) The moving grating technique; (2) The alternating field technique; and (3) The resonant intensity technique.

Descriptors :   *REFRACTION, *OPTICAL PROPERTIES, *CRYSTALS, *ELECTROOPTICS, REFRACTIVE INDEX, ELECTRIC FIELDS, NONLINEAR OPTICS, RESONANCE, GRATINGS(SPECTRA), AMPLIFICATION, SPACE CHARGE, BARIUM TITANATES.

Subject Categories : Optics
      Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE