Applied Physics B

, Volume 68, Issue 5, pp 877–885 | Cite as

Holographic recording by excitation of metastable electronic states in Na2[Fe(CN)5NO]·2H2O: a new photorefractive effect

  • M. Imlau
  • S. Haussühl
  • T. Woike
  • R. Schieder
  • V. Angelov
  • R.A. Rupp
  • K. Schwarz
Regular paper

Abstract.

Elementary holographic phase gratings can be written in single crystals of Na2[Fe(CN)5NO]·2H2O, sodiumnitroprusside, by excitation of metastable electronic states in the blue–green spectral range. For light polarized parallel to the crystallographic a and b axes of the orthorhombic crystal the light-induced modulation of the refractive index reaches Δn≈2×10-3 at λ=514.5 nm. Although the largest population of the metastable states is reached for light polarized parallel to the crystallographic c axis, a photorefractive response is not observed. In contrast to electro-optic photorefractive materials the photorefractive effect depends mono-exponentially on the exposure and on the modulation of the incident light interference pattern. Beam-coupling experiments demonstrate that written gratings are in phase with the interference pattern in correspondence with the fact that the excitation of the metastable electronic states is local. The width of the rocking curve shows that the holographic gratings are written completely over the volume of the crystal. Variations of the wavelengths within the excitation range as well as of the crystal thickness do not influence the maximum photorefractive response. Investigations on the grating vector of the written gratings show unambiguously that charge migration is not responsible for the photorefractive effect.

PACS: 33.80.-b; 42.40.E; 42.65.H; 42.70.Ln 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • M. Imlau
    • 1
  • S. Haussühl
    • 1
  • T. Woike
    • 1
  • R. Schieder
    • 2
  • V. Angelov
    • 3
  • R.A. Rupp
    • 4
  • K. Schwarz
    • 5
  1. 1.Institut für Kristallographie, Universität zu Köln, Zülpicherstr. 49b, D-50674 Köln, GermanyDE
  2. 2.I. Physikalisches Institut, Universität zu Köln, Zülpicherstr. 77, D-50934 Köln, GermanyDE
  3. 3.Department of Atomic Physics, Faculty of Physics, University of Sofia, 5, James Bourchier Blvd., 1146 Sofia, BulgariaBG
  4. 4.Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Wien, AustriaAT
  5. 5.Institut für Physikalische und Theoretische Chemie, Technische Universität Wien, Getreidemarkt 9, A-1060 Wien, AustriaAT

Personalised recommendations