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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 33 (1970), S. 343-344 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 15 (1978), S. 133-139 
    ISSN: 1432-0630
    Keywords: 72.40 ; 42.30 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The optical storage properties of LiTaO3:Fe are investigated and compared with those of the isomorphous compound LiNbO3:Fe. Absorption, photocurrent, photoconductivity and holographic measurements are reported. In the case of photovoltaic writing similar results for LiTaO3- and LiNbO3-crystals are obtained. However, in the case of photoconductive writing using external electric fields LiTaO3:Fe-crystals yield much better results due to large photoconductivity values. Considering the recording sensitivity and the extremely large storage time LiTaO3:Fe turns out to be one of the most promising materials for photorefractive storage of volume phase holograms.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0630
    Keywords: 61.70 ; 72.40 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Measurements of photoconductivity and light-induced absorption in KNbO3: Fe are performed at different light intensities and crystal temperatures. The results are interpreted in terms of a two-center charge transport model. Different model parameters may be evaluated from the experimental data. A complete set of parameters is suggested explaining the dependences of photoconductivity and light-induced absorption on light intensity and temperature for the KNbO3: Fe crystal investigated.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 57 (1993), S. 437-440 
    ISSN: 1432-0630
    Keywords: 78.20 ; 61.70 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Holograms recorded under suitable conditions in photorefractive BaTiO3 exhibit an unusual dark build-up. The diffraction efficiency increases by some orders of magnitude after the recording beams are switched off, and then steadily decreases afterwards. An interpretation of this effect in terms of a two-center charge transport model is given.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 58 (1994), S. 343-347 
    ISSN: 1432-0630
    Keywords: 42.40 ; 78.20 ; 72.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Beam-coupling is investigated in a nominally pure tetragonal potassium Tantalate-Niobate (KTN) crystal as a function of external electric field, spatial frequency and light wavelength. The variation of these parameters leads to a change of the direction of energy transfer between the two recording beams. The experimental results can be consistently described by a one-center charge-transport model taking into account electron and hole contributions to photoconductivity and space-charge limitations due to the available trap density.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0649
    Keywords: 42.40 ; 42.82 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Holographic measurements of light-induced refractive index changes in LiNbO3∶Ti waveguides are reported. The results demonstrate that Fe2+ centers are stabilized against oxidation in the region of large Ti concentration near the surface thus increasing the sensitivity to optical damage considerably. This undesired effect may be largely abolished by additional in-diffusion of protons.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0649
    Keywords: 61.70 ; 72.40 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new charge-transport model assuming one center in three different valence states is discussed for explanation of the photorefractive effect. Quantitative description of experimental results in KNb03:Fe by the model is demonstrated. Many similarities with the so-called “two-center” model are found although the microscopic explanation of the light-induced charge transport is rather different.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0649
    Keywords: 61.72.-y ; 72.40.+w ; 78.20.-e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Absorption, light-induced absorption changes, photo and dark conductivities, bulk photovoltaic currents and two-beam coupling gain coefficients are measured for oxidized, as grown and reduced BaTiO3:Rh,Fe crystals. Theoxidized sample shows hole conductivity and three photorefractive levels are present: Rh4+/5+ Fe4+/5+ and Rh3+/4+. The measurements indicate that Rh3+/4+ is responsible for the photo conductivity and that its energy level is located (0.9 ± 0.1) eV above the valence band edge. Theas grown sample also shows hole conductivity and two photorefractive levels are involved: Rh3+/4+ and Fe 3+/4+. The results yield that the Fe3+/4+ level is located (0.95 ± 0.05) eV above the valence band edge. In thereduced sample electrons are the dominant charge carriers and two levels are of importance. The shallow one is located (0.39 ± 0.05) eV below the conduction band edge. Here the performance of this crystal is strongly impaired by a pronounced sublinear photo conductivity.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0649
    Keywords: PACS:61.72.-y; 72.40.+w; 78.20.-e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Absorption, light-induced absorption changes, photo and dark conductivities, bulk photovoltaic currents and two-beam coupling gain coefficients are measured for oxidized, as grown and reduced BaTiO $_3$ :Rh,Fe crystals. The oxidized sample shows hole conductivity and three photorefractive levels are present: h $^{4+/5+}$ , Fe $^{4+/5+}$ and Rh $^{3+/4+}$ . The measurements indicate that Rh $^{3+/4+}$ is responsible for the photo conductivity and that its energy level is located $(0.9 \pm 0.1)$ eV above the valence band edge. The as grown sample also shows hole conductivity and two photorefractive levels are involved: Rh $^{3+/4+}$ and Fe $^{3+/4+}$ . The results yield that the Fe $^{3+/4+}$ level is located $(0.95 \pm 0.05)$ eV above the valence band edge. In the reduced sample electrons are the dominant charge carriers and two levels are of importance. The shallow one is located $(0.39 \pm 0.05)$ eV below the conduction band edge. Here the performance of this crystal is strongly impaired by a pronounced sublinear photo conductivity.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 63 (1996), S. 599-604 
    ISSN: 1432-0649
    Keywords: 42.40 ; 42.65 ; 42.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate holographic scattering processes in BaTiO3 pumped by two coherent copropagating waves. Four lines are observed on a screen behind the sample. The experimental results are well described by a model taking into account parametric mixing of four copropagating waves and limitations of optically induced space charge fields because of the finite trap density.
    Type of Medium: Electronic Resource
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