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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 15, Iss. 3 — Mar. 1, 1998
  • pp: 989–995

Z-scan-based investigations of photorefractive self-focusing in KNbO3 crystals

Roland Ryf, Andreas Lötscher, Christian Bosshard, Marko Zgonik, and Peter Günter  »View Author Affiliations

JOSA B, Vol. 15, Issue 3, pp. 989-995 (1998)

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We present experimental and theoretical results of photorefractive one-dimensional self-focusing in an Fe-doped KNbO3 crystal. The self-focusing is investigated by Z-scan experiments with and without an applied electric field. We observe the strongest focusing effect for a ratio Iˆ/ID6 of the beam peak intensity to the so-called dark intensity (the intensity at which photoconductivity is equal to the conductivity in the dark). The good agreement between the presented theory and experiment in the Z-scan technique allows the precise determination of dark intensity, the photovoltaic field, and the electric field inside the crystal.

© 1998 Optical Society of America

OCIS Codes
(160.5320) Materials : Photorefractive materials
(190.5330) Nonlinear optics : Photorefractive optics
(260.5950) Physical optics : Self-focusing

Roland Ryf, Andreas Lötscher, Christian Bosshard, Marko Zgonik, and Peter Günter, "Z-scan-based investigations of photorefractive self-focusing in KNbO3 crystals," J. Opt. Soc. Am. B 15, 989-995 (1998)

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