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Optical properties of iron‐doped lithium niobate crystal depending on iron content and temperature
Author(s) -
Yükselici M. H.,
Bulut D.,
Ömür B. Can,
Bozkurt A. Aşıkoğlu,
Allahverdi Ç.
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201451071
Subject(s) - lithium niobate , absorption (acoustics) , electric field , doping , lithium (medication) , materials science , absorption band , raman spectroscopy , analytical chemistry (journal) , crystal (programming language) , atmospheric temperature range , quantum tunnelling , condensed matter physics , chemistry , optics , optoelectronics , physics , medicine , chromatography , quantum mechanics , meteorology , computer science , composite material , programming language , endocrinology
The optical properties of LiNbO 3 crystals doped with iron at mol% between 0.015 and 0.1 were studied by optical absorption and Raman spectroscopies. The long wavelength tail below the fundamental absorption band is modeled by Urbach exponent assumed to be due to the tunneling of charged carriers through potential energy barrier bent by micro‐electric field. We presume that non‐uniform local charge distribution creates micro‐electric field. Temperature dependence of the Fe 2+ absorption band is reported over the range from 100 to 250 K. The Fe 2+ absorption band at around 2.58 eV is red shifted at a rate of 4 × 10 −5 eV K −1 as the temperature increases. We conclude that Li deficiency increases with iron, which sit on Li sites.