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Effect of annealing in Li-rich ambient on the optical absorption and crystallinity of Er doped LiNbO3 crystals

R. BHATT1,* , S. GANESAMOORTHY1, INDRANIL BHAUMIK1, A. K. KARNAL1, G. BHAGAVANNARAYANA2, P. K. GUPTA1

Affiliation

  1. LMDDD, Raja Ramanna Centre for Advanced Technology, Indore (MP) - 452013, India.
  2. Materials Characterization Division, National Physical Laboratory, Dr K. S. Krishnan Road, New Delhi -110 012, India

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 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 21arc-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 disorderness of the structure. FT-IR spectra reveals elimination the H + defects from the near SLN:Er crystals due to annealing..

Keywords

Lithium niobate, Vapor transport equilibrium, High resolution X-ray diffraction, Imperfections.

Submitted at: Feb. 21, 2011
Accepted at: March 16, 2011

Citation

R. BHATT, S. GANESAMOORTHY, INDRANIL BHAUMIK, A. K. KARNAL, G. BHAGAVANNARAYANA, P. K. GUPTA, Effect of annealing in Li-rich ambient on the optical absorption and crystallinity of Er doped LiNbO3 crystals, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 3, pp. 245-250 (2011)