Measurement of laser-induced refractive index changes of Mg-doped congruent and stoichiometric LiNbO3

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Abstract

Light-induced refractive index changes and nonlinear absorption of undoped and Mg-doped LiNbO3 with congruent and stoichiometric composition were investigated by the Z-scan method using an all-visible argon-ion laser with intensities up to the MW/cm2 level. Charge coupled device recordings demonstrate that the Z-scan method is suitable for quantitative study of Mg-doped samples, while it can be used only for qualitative measurements of undoped samples because of beam fanning in the latter case. Stoichiometric LiNbO3 doped with 5 mol% Mg shows positive refractive index changes opposite to those in cases of undoped congruent, undoped stoichiometric and 5 mol% Mg-doped congruent LiNbO3. The refractive index change of Δne=2.5×10-5 measured at 0.37 MW/cm 2 light intensity for stoichiometric LiNbO3:Mg is six times smaller than that of congruent LiNbO3:Mg at 0.1 MW/cm 2.

Original languageEnglish
Pages (from-to)2245-2247
Number of pages3
JournalApplied Physics Letters
Volume80
Issue number13
DOIs
Publication statusPublished - Apr 1 2002

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refractivity
lasers
luminous intensity
charge coupled devices
recording
argon
ions

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  • Physics and Astronomy (miscellaneous)

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Measurement of laser-induced refractive index changes of Mg-doped congruent and stoichiometric LiNbO3. / Pálfalvi, L.; Almási, G.; Hebling, J.; Péter, A.; Polgár, Katalin.

In: Applied Physics Letters, Vol. 80, No. 13, 01.04.2002, p. 2245-2247.

Research output: Contribution to journalArticle

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AU - Polgár, Katalin

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AB - Light-induced refractive index changes and nonlinear absorption of undoped and Mg-doped LiNbO3 with congruent and stoichiometric composition were investigated by the Z-scan method using an all-visible argon-ion laser with intensities up to the MW/cm2 level. Charge coupled device recordings demonstrate that the Z-scan method is suitable for quantitative study of Mg-doped samples, while it can be used only for qualitative measurements of undoped samples because of beam fanning in the latter case. Stoichiometric LiNbO3 doped with 5 mol% Mg shows positive refractive index changes opposite to those in cases of undoped congruent, undoped stoichiometric and 5 mol% Mg-doped congruent LiNbO3. The refractive index change of Δne=2.5×10-5 measured at 0.37 MW/cm 2 light intensity for stoichiometric LiNbO3:Mg is six times smaller than that of congruent LiNbO3:Mg at 0.1 MW/cm 2.

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