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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 20, Iss. 8 — Aug. 1, 2003
  • pp: 1643–1648

Improvements of sensitivity and refractive-index changes in photorefractive iron-doped lithium niobate crystals by application of extremely large external electric fields

Marc Luennemann, Ulrich Hartwig, and Karsten Buse  »View Author Affiliations


JOSA B, Vol. 20, Issue 8, pp. 1643-1648 (2003)
http://dx.doi.org/10.1364/JOSAB.20.001643


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Abstract

Applying external electric fields of as much as 65 kV/mm reveals significant enhancement of refractive-index changes Δns and of photorefractive sensitivity S. Samples with different iron concentrations and oxidation–reduction states were investigated. Refractive-index changes of up to Δns=11.5×10-4 and sensitivities as high as S=40 cm/J were measured (ordinary light polarization; light wavelength, λ=488 nm). The refractive-index changes are space-charge limited, but the photorefractive sensitivity S exhibits for large externally applied electric fields a linear increase up to the highest field values used. No nonlinear enhancement of the charge transport was observed. However, the excellent high-field material performance and the record values for Δns and S obtained improve the applicability of LiNbO3 crystals.

© 2003 Optical Society of America

OCIS Codes
(090.2900) Holography : Optical storage materials
(160.3730) Materials : Lithium niobate
(160.4760) Materials : Optical properties
(190.5330) Nonlinear optics : Photorefractive optics

Citation
Marc Luennemann, Ulrich Hartwig, and Karsten Buse, "Improvements of sensitivity and refractive-index changes in photorefractive iron-doped lithium niobate crystals by application of extremely large external electric fields," J. Opt. Soc. Am. B 20, 1643-1648 (2003)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-20-8-1643

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