INTERRELATION OF INTRINSIC DEFECTS AND OPTICAL ABSORPTION PROPERTIES OF LITHIUM NIOBATE (LiNbO3) CRYSTALS

Author:

NGURAH MADE D. P.1,SAHAR M. R.2,SUDIN Md. RADZI2

Affiliation:

1. Jurusan Fisika, FMIPA, Universitas Negeri Semarang (UNNES), Semarang 50299, Indonesia

2. Physics Dept., Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia

Abstract

The optical absorption of pure lithium niobate ( LiNbO3 ) single crystals were measured from the ultraviolet to the visible range with the incident light being parallel to the z axis of the crystals. The wavelength dependence of the absorption coefficient α and its root α1/2 (α versus hν and α1/2 versus hν, respectively) were calculated and the characteristics of the absorption edges were discussed. The absorption edges below 3.6 eV of all samples are attributable to indirect transition. The energy gap Eg and E′g of the crystals, which correspond to the direct transition and the indirect transition, respectively, and the energy of phonons Ep taking part in the indirect transition were calculated. It was found that the energy band structure depends on [ Li ]/[ Nb ] ratio of lithium niobate crystals. The change of E′g may be attributable to the distortion of energy band structures resulting from the intrinsic defects.

Publisher

World Scientific Pub Co Pte Lt

Subject

Physics and Astronomy (miscellaneous),Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

Reference12 articles.

1. K. K. Wong, Properties of Lithium Niobate, EMIS Datareviews Series, No. 28 (IEE-INSPEC, London, 2002) pp. 1–3.

2. Defects in LiNbO3—I. experimental aspects

3. Influence of stoichiometry on defect-related phenomena inLiNbO3

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