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Optical properties of WO3 doped congruent LiNbO3 crystals

Han, T.P.J. and Hill, A. and Gallagher, H.G. and Jaque, F. (2002) Optical properties of WO3 doped congruent LiNbO3 crystals. Chemical Physics Letters, 364 (3-4). pp. 323-327. ISSN 0009-2614

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Abstract

The dependence of the optical absorption band edge, ordinary and extraordinary refractive index, powder second harmonic generation and the non-linear coefficient, d33, of congruent LiNbO3 crystals doped with WO3 are reported. It has been found that the referred parameters show a clear singularity for a concentration in the range of 1.5-2%. In comparison with previous works on congruent LiNbO3 crystals doped with divalent and trivalent ions a charge compensation mechanism is proposed to explain the role of the cation. The experimental data of no and ne are described by a generalised Sellmeier equation considering the different ions sites in the sample.