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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 2 — Jan. 10, 2009
  • pp: 161–166

Photorefractive dynamic properties of Ca 2 + -doped strontium barium niobate crystals

Ch. Y. Gao, H. R. Xia, J. Q. Xu, C. L. Zhou, Sh. Ch. Si, H. J. Zhang, and J. Y. Wang  »View Author Affiliations

Applied Optics, Vol. 48, Issue 2, pp. 161-166 (2009)

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Measurements for photorefractive dynamic properties under polarized light with different luminous intensity and wavelength at 650 nm were performed in calcium-doped strontium barium niobate crystals as a function of the time. Experimental results further validated that the different input luminous intensities influence only the saturated time and photorefractive velocity of the photorefractive crystals. Birefringence experiments suggest that an input luminous intensity oscillatory threshold should exist between 64 m W / cm 2 and 13 m W / cm 2 . The dynamic change of refractive index from self-focusing to asymmetric self-defocusing was also measured and regarded as the mutual results of the nonuniform-intensity incidence and positive thermal lens effect, which was validated by a further experiment based on the Michelson interference. Also, oscillation accompanying change in the dynamic indices was analyzed and attributed to the high dielectric effect as well as asymmetric self-defocusing in this investiga tion.

© 2009 Optical Society of America

OCIS Codes
(160.5320) Materials : Photorefractive materials
(190.0190) Nonlinear optics : Nonlinear optics
(260.1440) Physical optics : Birefringence

ToC Category:
Nonlinear Optics

Original Manuscript: March 12, 2008
Revised Manuscript: September 18, 2008
Manuscript Accepted: October 24, 2008
Published: January 7, 2009

Ch. Y. Gao, H. R. Xia, J. Q. Xu, C. L. Zhou, Sh. Ch. Si, H. J. Zhang, and J. Y. Wang, "Photorefractive dynamic properties of Ca2+-doped strontium barium niobate crystals," Appl. Opt. 48, 161-166 (2009)

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