Abstract
Experimental study of non-linear scattering (NLS) in nominally pure, Mg- and Zr-doped LiNbO3 crystals with a varying dopant concentration are reported in this paper. The study is undertaken by Z-scan technique with a cw-excitation at 514.5 nm. A modified open-aperture Z-scan experimental setup is used to evaluate the contributions of NLS in the observed transmission attenuation. Study of these open-aperture Z-scan traces shows that NLS has marked magnitude at moderate and high light intensities in undoped, strongly Zr-doped and Mg-doped LiNbO3, and a very significant magnitude in the moderately Zr-doped LiNbO3 crystals even at low intensities. NLS is related to the photoinduced light scattering (PILS), which is explained by holographic amplification of the seed scattering due to photorefractive effect.
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