Photorefractive effect in doped Pb₅Ge₃O₁₁ and in (Pb₁₋ₓ Baₓ)₅ Ge₃O₁₁
Publication date
1998-04
Document type
Research article
Author
Organisational unit
Universität Osnabrück
Scopus ID
Series or journal
Journal of applied physics : AIP's archival journal for significant new results in applied physics
ISSN
Periodical volume
83
Periodical issue
7
First page
3473
Last page
3479
Part of the university bibliography
Nein
Language
English
Abstract
The photorefractive effect is studied in ferroelectric lead germanate crystals Pb₅Ge₃O₁₁, including undoped, Fe- and Rh-doped crystals, as well as (Pb₁-x Bax)₅ Ge₃O₁₁ solid solutions. Two kinds of processes are involved in photorefractive interactions: a fast response with a time constant generally less than 1 s and the formation of slow gratings with time constants of several hours for intensities in the range of 1-30 kW/m2. Basic photorefractive parameters corresponding to the fast response, such as dark- and photoconductivities, the sign of the main charges involved in the transport process, effective trap densities, and activation energies are determined. Compared to theoretical predictions the measured effects are too small which is attributed mainly to electron-hole competition. © 1998 American Institute of Physics.
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