Urbach rule and optical properties of the LiNbO3 and LiTaO3

Authors
Cabuk, S Mamedov, A
Citation
S. Cabuk et A. Mamedov, Urbach rule and optical properties of the LiNbO3 and LiTaO3, J OPT A-P A, 1(3), 1999, pp. 424-427
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics
Journal title
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
ISSN journal
14644258 → ACNP
Volume
1
Issue
3
Year of publication
1999
Pages
424 - 427
Database
ISI
SICI code
1464-4258(199905)1:3<424:URAOPO>2.0.ZU;2-8
Abstract
Optical spectroscopy methods are used to study the spectra of some oxygen-o ctahedral ferroelectrics-namely LiNbO3 and LiTaO3. It is shown that for the measured range of E and T, alpha varies exponentially with the photon ener gy following the empirical Urbach rule. A study of the role of the BO6-octa hedron by using spectroscopic methods can cast light on the many physical p henomena that take place in LiNbO3 and LiTaO3. For these crystals, absorpti on edge, band gap, Urbach constants and phonon energy are found.