Počet záznamů: 1

An optical and dielectric spectroscopy study of Er.sup.3+./sup.-doped KTaO.sub.3./sub..

  1. 1.
    0368463 - FZU-D 2012 RIV DE eng J - Článek v odborném periodiku
    Trepakov, Vladimír - Skvortsov, A. - Poletaev, N. - Potůček, Zdeněk - Nuzhnyy, Dmitry - Jastrabík, Lubomír - Dejneka, Alexandr
    An optical and dielectric spectroscopy study of Er3+-doped KTaO3.
    Physica Status Solidi B-Basic Solid State Physics. Roč. 248, č. 12 (2011), s. 2908-2915 ISSN 0370-1972
    Grant CEP: GA ČR GC202/09/J017; GA AV ČR KAN301370701; GA MŠk(CZ) 1M06002
    Výzkumný záměr: CEZ:AV0Z10100520; CEZ:AV0Z10100522
    Klíčová slova: Er3+ centres * IR spectroscopy * optical absorption photoluminescence * potassium tantalate * THz spectroscopy
    Kód oboru RIV: BH - Optika, masery a lasery
    Impakt faktor: 1.316, rok: 2011

    We report the results of a multifaceted study of optical and dielectric properties of erbium-doped potassium tantalate crystals. Studies of optical absorption and photoluminescence allowed us to determine the system of energy levels that control the main internal optical transitions in the 4f electronic shell of Er3+ in KTaO3. It was found that at least two types of Er-centres,major and minor ones, are present. The major centres are noncubic,formed by Er3+ substituting for K+ sites; these are responsible for the n-type conductivity of crystals. Wideband optical absorption with a maximum at 1.13 eV was attributed to polaron formation.Far-IR reflectivity studies revealed an increase in the frequency of the lowest transverse optical mode and a decrease in the dielectric permittivity in comparison with undoped crystals. This stiffening means the suppression of the ferroelectric instability in the system.
    Trvalý link: http://hdl.handle.net/11104/0202800