Holographic and non-steady-state photocurrent characterization of photorefractive barium-calcium titanate

Autor(en): Korneev, N
Mayorga, D
Stepanov, S
Veenhuis, H
Buse, K
Kuper, C
Hesse, H
Kratzig, E
Stichwörter: charge transport; Optics; oxidic crystals; PHOTOCONDUCTIVITY RELAXATION; photorefractive materials; TANTALATE-NIOBATE CRYSTALS
Erscheinungsdatum: 1999
Herausgeber: ELSEVIER SCIENCE BV
Journal: OPTICS COMMUNICATIONS
Volumen: 160
Ausgabe: 1-3
Startseite: 98
Seitenende: 102
Zusammenfassung: 
Measurements of non-steady-state photocurrents and of time-modulated conductivities for homogeneous illumination of varying intensity are performed with? a photorefractive iron-doped barium-calcium titanate crystal of the congruently melting composition (Ba0.77Ca0.23TiO3, BCT). The diffraction efficiency and the two-beam coupling gain are determined fi-om conventional holographic experiments. Debye screening and diffusion lengths are found to be of the order of 0.1 mu m The response-time of the material is 2 s (light intensity 0.2 W /cm(2), wavelength 514 nm) and the dark storage time is 6 s. The measured refractive index changes are only one third of the values, which are expected from the known electrooptic coefficients and space-charge fields. (C) 1999 Elsevier Science B.V. All rights reserved.
ISSN: 00304018
DOI: 10.1016/S0030-4018(98)00648-8

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