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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 19, Iss. 8 — Aug. 1, 2002
  • pp: 1822–1829

Photorefractive properties of lithium and copper in-diffused lithium niobate crystals

Jörg Imbrock, Albert Wirp, Detlef Kip, Eckhard Krätzig, and Dirk Berben  »View Author Affiliations


JOSA B, Vol. 19, Issue 8, pp. 1822-1829 (2002)
http://dx.doi.org/10.1364/JOSAB.19.001822


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Abstract

Near-stoichiometric copper-doped lithium niobate crystals are fabricated by in-diffusion of thin layers of evaporated copper and a subsequent vapor transport equilibration treatment. The crystals are heated in a Li-rich atmosphere to increase the Li content. To determine the photorefractive properties, holographic as well as electrical measurements are performed. Saturation values of the refractive-index changes ΔnS, bulk photovoltaic current densities jphv, photoconductivities σph, and holographic sensitivities S are measured for light intensities up to 104 W/m2. Comparison with experimental data of congruent crystals indicates that the specific photoconductivity is 15 times larger after a vapor transport equilibration treatment. The specific bulk photovoltaic coefficient β* is 2 times larger, refractive-index changes are 7 times smaller, and the holographic sensitivity is up to 4 times larger.

© 2002 Optical Society of America

OCIS Codes
(090.7330) Holography : Volume gratings
(160.5320) Materials : Photorefractive materials
(210.2860) Optical data storage : Holographic and volume memories

Citation
Jörg Imbrock, Albert Wirp, Detlef Kip, Eckhard Krätzig, and Dirk Berben, "Photorefractive properties of lithium and copper in-diffused lithium niobate crystals," J. Opt. Soc. Am. B 19, 1822-1829 (2002)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-19-8-1822

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