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Influence of non-stoichiometric defects on nonlinear absorption and refraction in Nd:Zn co-doped lithium niobate by J.N. Babu Reddy; Suja Elizabeth; H.L. Bhat; N. Venkatram; D. Narayana Rao is a Materials Science article available to read on EtoBox.

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

Nonlinear absorption and refraction phenomena in stoichiometric lithium niobate (SLN) pure and codoped 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 À T OA ) vs. Ln(I 0 ) using Sutherland's theory (s = 2.1, for 3PA). The nonlinear refractive index (n 2 ) 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 n 2 fall into the same range as those obtained for the materials of similar band gap.

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Author

J.N. Babu Reddy; Suja Elizabeth; H.L. Bhat; N. Venkatram; D. Narayana Rao

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0925-3467)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)