Applied Physics B

, Volume 68, Issue 5, pp 989–993

Light-induced damage mechanisms in α-phase proton-exchanged LiNbO3 waveguides

  • A. Alcázar de V.
  • J. Rams
  • J.M. Cabrera
  • F. Agulló-López
Regular paper

DOI: 10.1007/s003400050735

Cite this article as:
Alcázar de V., A., Rams, J., Cabrera, J. et al. Appl Phys B (1999) 68: 989. doi:10.1007/s003400050735

Abstract.

The overall power and far-field pattern of the beam out-coupled from a single-mode planar proton-exchanged LiNbO3 waveguide in the α-phase have been studied for in-coupled intensities within the range 20–700 W/cm2. The steady-state output versus input power response shows three definite stages designated as I, II, and III in order of increasing input intensity. In stage I the output varies linearly with input and the far-field pattern does not show appreciable changes. In stage II, the pattern is considerably broadened and displays a number of steady peaks and dips indicative of a filamentary structure of the beam. As in bulk LiNbO3, these damage features are explained in terms of parametric processes involving the amplification of scattered (noise) light. An additional broadening is observed in stage III together with the occurrence of a fluctuating profile (chaotic response) attributed to random fluctuations in the coupling parameters. The threshold input intensity separating stages I and II is related to the intensity-dependence of the photovoltaic field.

PACS: 42.82E

Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • A. Alcázar de V.
    • 1
  • J. Rams
    • 2
  • J.M. Cabrera
    • 2
  • F. Agulló-López
    • 2
  1. 1.Depto. Aerotecnia, EUIT Aeronáutica, Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros, 3, E - 28040, Madrid, SpainES
  2. 2.Depto. Física de Materiales C-IV, Universidad Autónoma de Madrid, Canto Blanco, E - 28049 Madrid, SpainES