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Author: search.filters.author.Hsu, KYSubject: search.filters.subject.optical properties

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    Effect of ruthenium doping on the optical and photorefractive properties of Bi12TiO20 single crystals
    (2002-03-15)
    Marinova, V
    ;
    Hsieh, ML
    ;
    Lin, SH
    ;
    Hsu, KY
    ;
    電子物理學系
    Bi12TiO20 (BTO) single crystals nominally pure and doped with ruthenium are grown by top-seeded solution growth method. The effect of ruthenium concentration on optical and photorefractive properties is studied. Strong influence of doping on these properties is observed. It is shown that optical transmission of crystal samples with higher ruthenium content is shifted to the near IR spectral region, while the absorption coefficient is considerably increased. The optical activity of Ru doped crystals is further reduced in comparison with undoped BTO. Photochromic effect is observed in strongly doped crystal. Photorefractive properties are experimentally investigated using two-beam coupling. Response time and diffraction efficiency are changed with ruthenium content. (C) 2002 Elsevier Science B.V. All rights reserved.
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    Light-induced properties of doped Bi4Ge3O12 single crystals
    (2003)
    Marinova, V
    ;
    Lin, SH
    ;
    Gospodinov, M
    ;
    Hsu, KY
    ;
    光電工程學系
    Optically homogeneous bismuth germanate Bi4Ge3O12 single crystals doped with vanadium, cobalt and vanadium plus cobalt have been successfully grown by Czohralski technique with automatically diameter-weight control. The distribution coefficients for individual doping elements are determined. The effect of doping on the light-induced properties of BGO single crystals is studied. Optical absorption spectrum of annealed samples can be strongly modified under ultraviolet illumination. The photochromic effect is optically or thermally reversible from one state to another. Volt-amper charactersitcs show linear behavour and dark conductivity values are sigma similar to 10(-13) (Omega.cm)(-1). Holographic grating were successfully recorded in all investigated doped crystals at 514 nm.
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    Light-induced absorption of Ru-doped Bi12TiO20 crystals
    (2003)
    Piquette, S
    ;
    Marinova, V
    ;
    Lin, SH
    ;
    Hsu, KY
    ;
    光電工程學系
    The effect of ruthenium doping on optical properties of Bi12TiO20 (BTO) single crystals is studied. A low concentration of ruthenium do not change absorption behavior of BTO, however higher ruthenium addition significantly shifts the optical absorption to the near infrared spectral region with an absorption shoulder appearing around 1.8 eV. The absorption coefficient increases with increasing the Ru concentration. Light-induced absorption changes are observed and the dynamics of build-up and dark decay processes are investigated. Results show that concentration of shallow levels increase with Ru content. Evolution of the build -up and dark decay of light induced absorption consists of fast and slow components: the first process occurs within few seconds, while the second one needs several hours (or days). It is established that light-induced absorption can be modified by preliminary illumination and thermal treatments thus multilevel lead to the transient and persistent parts of light-induced absorption. A model, assuming one deep and two shallow levels is proposed to explain the bi-exponential behavior of the build-up and the dark decay of light- induced absorption when the crystals are preliminary annealed in oxygen atmosphere.