(1) Physics Department, University of Osnabrück, 49069 Osnabrück, Germany;(2) Institute of Physics, Technical University of Clausthal, 38678 Clausthal-Zellerfeld, Germany
Abstract:
Iron-doped lithium tantalate crystals are grown by the Czochralski method and their photorefractive properties are examined with holographic methods. Dynamic range, holographic sensitivity, photoconductivity, and dark storage time are measured in dependence on the iron concentration and light intensity. The largest refractive-index change for ordinarily polarized light is 3.5×10-4, in comparison with 6.2×10-4 for iron-doped lithium niobate. Due to a small mobility of protons the dark storage time of holograms in lithium tantalate is larger than that in lithium niobate. PACS 42.40.Pa; 42.70.Ln
