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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 4 — Feb. 20, 2006
  • pp: 1533–1540

Long-living currents induced by nanosecond light pulses in LiNbO3 crystals

O. Beyer, C. von Korff Schmising, M. Luennemann, K. Buse, and B. Sturman  »View Author Affiliations

Optics Express, Vol. 14, Issue 4, pp. 1533-1540 (2006)

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We have obtained first solid evidence of strong charge separation that is caused by relaxing localized electrons in a polar medium: Space-charge gratings induced in highly-doped LiNbO3:Fe crystals by interfering nanosecond light pulses at 532 nm show a highly peculiar long-term behavior (buildup or/and decay) in the dark. It depends strongly on the applied electric field E0 (ranging from -140 to +640 kV/cm) and occurs on a time scale of (1 – 100) s which is much larger than the relaxation time of photo-electrons and smaller than the dark dielectric relaxation time. All peculiarities observed are fully described by a charge-transport model that incorporates the energy relaxation of electrons within a band of localized Fe2+ states and a long-living, field-gradient-independent “polar current” directed along the polar axis.

© 2006 Optical Society of America

OCIS Codes
(160.3730) Materials : Lithium niobate
(160.5320) Materials : Photorefractive materials

ToC Category:

Original Manuscript: November 8, 2005
Revised Manuscript: February 3, 2006
Manuscript Accepted: February 6, 2006
Published: February 20, 2006

O. Beyer, C. von Korff Schmising, M. Luennemann, K. Buse, and B. Sturman, "Long-living currents induced by nanosecond light pulses in LiNbO3 crystals," Opt. Express 14, 1533-1540 (2006)

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