Investigation of photorefractive subharmonics in the absence of wavemixing

B.I. Sturman, T.E. McClelland, David J. Webb, E. Shamonina, K.H. Ringhofer

Research output: Contribution to journalArticlepeer-review


Using a new optical configuration free from the influence of photorefractive optical nonlinearity, we investigate the main characteristics of the spatial subharmonic K/2 excited in a Bi12SiO20 crystal by a light-intensity pattern with wave vector K and frequency O. It is shown that in a large region of intensity and applied electric field the optimum value O of the frequency corresponds to the conditions of parametric excitation of the weakly damped eigenmodes of the medium: the space-charge waves. The threshold and above-threshold characteristics of the subharmonic regime are in good agreement with the theory.
Original languageEnglish
Pages (from-to)1621-1627
Number of pages7
JournalJournal of the Optical Society of America B
Issue number9
Publication statusPublished - 1 Sept 1995

Bibliographical note

This paper was published in Journal of the Optical Society of America B - Optical Physics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. © 1995 Optical Society of America.


  • optical configuration
  • photorefractive optical nonlinearity
  • spatial subharmonic K/2
  • Bi12SiO20 crystal
  • light-intensity pattern
  • wave vector K
  • frequency Ω
  • space-charge waves
  • subharmonic regime


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