Nonlinear effects in thermal fixing of photorefractive holograms: harmonics and combinational gratings

  1. J. Limeres 1
  2. M. Carrascosa 1
  3. E. García de la Cera 1
  4. E.M. de Miguel-Sanz 1
  5. L. Arizmendi 1
  1. 1 Departamento de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid
Actas:
Photorefractive Effects, Materials, and Devices

Editorial: Optica Publishing Group

ISBN: 1-55752-693-1

Año de publicación: 2001

Páginas: 180

Tipo: Aportación congreso

DOI: 10.1364/PEMD.2001.180 GOOGLE SCHOLAR lock_openAcceso abierto editor

Resumen

The inherent nonlinearity of the charge transport processes in photorefractive materials give rise to some new phenomena, such as generation of harmonics or grating cross talk, that have been extensively investigated for non-fixed gratings. Here, we investigate the corresponding phenomena taking place during the thermal fixing process. We study in detail the kinetics of the thermal fixing process for high light modulation initial recording that results to be itself nonlinear. For single grating recording we obtain the amplitude of the first and second harmonic proton gratings and the final developed amplitude for the first harmonic. In turn, for multiple recording we focus our attention on combinational components. It is obtained that the key parameters that control nonlinear fixing are the proton concentration and grating K-vectors. Some preliminary experimental data are also presented.