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Optical and holographic properties of Fe+Mn co-doped Bi4Ge3O12 crystals |
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| Authors: | Vera Marinova Dimitrina Petrova Ken Yuh Hsu |
| Institution: | a Central Laboratory of Optical Storage and Processing of Information, Bulgarian Academy of Science, P.O. Box 95, Sofia 1113, Bulgaria b South West University, Department of Physics, 66 “Ivan Mihailov” Street, 2700 Blagoevgrad, Bulgaria c Department of Electrophysics, National Chiao Tung University, 1001 Ta Hsueh Road, 30050 Hsinchu, Taiwan d Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 Ta Hsueh Road, 30050 Hsinchu, Taiwan |
| Abstract: | The effect of iron and manganese co-doping on the light-induced, dark- and photoconductivity and holographic properties of Bi4Ge3O12 crystals in comparison with Fe- and Mn-single doping is studied. Fe+Mn co-doped crystals exhibited strong photochromic effect at room temperature, the photochromic effect being fully reversible by thermal annealing. The observed light-induced absorption changes and non-linear dependence of photoconductivity on light intensities indicate deep and shallow photoactive levels contribution to the charge transport mechanism of Fe+Mn co-doped BGO. Holographic gratings are successfully recorded at different wavelengths and a possibility to extend the photorefractive sensitivity into the red spectral range is demonstrated. It is found furthermore that Fe+Mn-doping combination leads to faster response time during holographic recording, especially after a preliminary exposure with ultraviolet light, in comparison with Fe- and Mn-single doping. |
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