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  • PACS: 42.65.Hw; 42.70.Nq  (2)
  • Springer  (2)
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  • Springer  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Different temperature dependences of photorefractive parameters of Ce-doped and Rh-doped BaTiO3 (1999)
    Springer
    Applied physics 68 (1999), S. 211-215 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Hw; 42.70.Nq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: eff and the electro-optic coefficient r33 in Ce-doped and Rh-doped BaTiO3 were determined by two-beam coupling measurements. It was found that the effective trap density Neff of BaTiO3:Ce increases whereas that of BaTiO3:Rh decreases with increasing temperature. The electro-optic coefficient r33 of both crystals increases with temperature. The photorefractive response times were also measured and found to decrease with different rates as temperature increases in the two crystals. The results were discussed by using the two-centre model for BaTiO3:Ce and three-charge-state model for BaTiO3:Rh. We found that the different temperature dependence of Neff in the two crystals was due to the fact that the deep- and shallow-trap levels in BaTiO3:Ce are caused by different impurity centres whereas those in BaTiO3:Rh are caused by different charge states of the same impurity centre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050608
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of impurity levels in Rh-doped and Ce-doped photorefractive BaTiO3 (2000)
    Springer
    Applied physics 70 (2000), S. 543-548 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Hw; 42.70.Nq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Impurity levels, light-induced and thermo-induced charge transfer processes in Rh-doped and Ce-doped photorefractive BaTiO3 were studied. The thermal depths and optical transitions of these impurity levels in the crystals were determined by using such methods as light-induced absorption, thermo-induced absorption, and grating dark decay. The origins of these impurity levels were discussed. We demonstrated, for the first time to our knowledge, that thermo-induced absorption spectroscopy is a useful and complementary technique for investigating the impurity levels in photorefractive crystals. With this technique, the deep impurity level generated by Ce in BaTiO3:Ce was revealed and identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050859
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    Paper (German National Licenses)
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