Bhatt, R. and Ganesamoorthy, S. and Bhaumik, Indranil and Karnal, A. K. and Bhagavannarayana, G. and Gupta, P. K. (2011) Effect of annealing in Li-rich ambient on the optical absorption and crystallinity of Er doped LiNbO3 crystals. Journal of Optoelectronics and Advanced Materials , 13 (3). pp. 245-250. ISSN 1454-4164

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Abstract

The crystalline perfection of Er doped LiNbO3 crystals in near stoichiometric (SLN:Er) and congruent (CLN:Er) form was studied. Er doped (0.25, 0.5 and 1.0 mol. % Er2O3) CLN:Er crystals were grown by Czochralski technique from congruent melt composition. CLN:Er wafers were annealed in Li rich ambient (Vapor transport equilibrium; VTE) at 1100 degrees C for 100 h to prepare near SLN:Er doped crystal. Optical absorbance studies confirmed an increase in Li content of near SLN:Er crystals. Absorption spectra also shows narrowing of absorption peak linewidth for near SLN:Er crystals. High resolution Xray diffraction (HRXRD) studies revealed single sharp diffraction peak with a FWHM of 21 arc-sec for undoped crystal in comparison to relatively broad 70 arc-secs for as grown CLN:Er and near SLN:Er (annealed) crystal. Near SLN:Er shows an increase in diffraction peak intensity due to annealing induced reduction in Li-vacancies and disordemess of the structure. FT-IR spectra reveals elimination the H+ defects from the near SLN:Er crystals due to annealing.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s INOE Publishing House.
Uncontrolled Keywords:	Lithium niobate; Vapor transport equilibrium; High resolution X-ray diffraction; Imperfections
Subjects:	Applied Physics/Condensed Matter > Optics Materials Science Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	29 Nov 2012 07:07
Last Modified:	29 Nov 2012 07:07
URI:	http://npl.csircentral.net/id/eprint/861

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