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Optical Absorption Edge of Mg + Zn: LiNbO 3
Author(s) -
Yang Xiaolong,
Xu Guanfeng,
Li Heping,
Zhu Jianguo,
Wang Xiu
Publication year - 1996
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170310418
Subject(s) - absorption edge , absorption (acoustics) , transmittance , dopant , attenuation coefficient , doping , materials science , crystal (programming language) , ultraviolet , wavelength , analytical chemistry (journal) , infrared , band gap , optics , chemistry , optoelectronics , physics , chromatography , computer science , composite material , programming language
Abstract The optical transmittance of LiNbO 3 single crystal double doped with MgO and ZnO was measured from the ultraviolet to the visible range. The wavelength dependence of the absorption coefficient α and its root α 1/2 (α versus hv and α 1/2 versus hv , respectively) were calculated and the characteristics of the absorption edge were discussed. The energy gaps E g and E g of the crystals which correspond to the direct transition and the indirect transition, respectively, and the energy of phonons taking part in the indirect transition were calculated. The effects of dopants Mg and Zn on the optical absorption properties are discussed. It was found that the energy E g of our sample which was double doped with MgO and ZnO was smaller than that of congruent LN, causing the indirect transition absorption edge to move towards the infrared.