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Influence of non-stoichiometric defects on nonlinear absorption and refraction in Nd:Zn co-doped lithium niobate

Babu Reddy, JN and Suja, Elizabeth and Bhat, HL and Venkatram, N and Rao, Narayana D (2009) Influence of non-stoichiometric defects on nonlinear absorption and refraction in Nd:Zn co-doped lithium niobate. In: Optical Materials, 31 (6). pp. 1022-1026.

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Abstract

Nonlinear absorption and refraction phenomena in stoichiometric lithium niobate (SLN) pure and co-doped with Zn and Nd, and congruent lithium niobate (CLN) were investigated using Z-scan technique. Femtosecond laser pulses from Ti:Sapphire laser (800 nm, 110 fs pulse width and 1 kHz repetition rate) were utilized for the experiment. The process responsible for nonlinear behavior of the samples was identified to be three photon absorption (3PA). This is in agreement with the band gap energies of the samples obtained from the linear absorption cut off and the slope of the plot of Ln(1 − TOA) vs. Ln(I0) using Sutherland’s theory (s = 2.1, for 3PA). The nonlinear refractive index (n2) of Zn doped samples was found to be lower than that of pure samples. Our experiments show that there exists a correlation between the nonlinear properties and the stoichiometry of the samples. The values of n2 fall into the same range as those obtained for the materials of similar band gap.

Item Type: Journal Article
Additional Information: Copyrights of this article belongs to Elsevier Science.
Keywords: Nonlinear optics;Nonlinear optical crystals;Z-scan technique; Stoichiometriclithium niobate.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 21 Aug 2009 11:16
Last Modified: 19 Sep 2010 05:31
URI: http://eprints.iisc.ernet.in/id/eprint/20026

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