Enhancement of blue holographic properties in Zr4+-doped near stoichiometric Fe:LiNbO3 crystals |
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| Authors: | Yexia Fan Zemin Yu Wenhui Li Chao Xu Kuo Fu |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, PR China;2. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, PR China;3. School of Chemistry and Material Science, Northwest University, Xi an 710001, PR China |
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| Abstract: | The near stoichiometric LiNbO3 crystals co-doped with ZrO2 and Fe2O3 have been grown from a Li-rich melt (Li/Nb=1.38, atomic ratio) by the Czochralski method in air atmosphere at the first time. The OH? absorption and UV–vis absorption spectra were characterized to investigate the defect structure of the crystals. The appearances of the 3479 cm?1 absorption peak and 358 nm absorption edge manifest that the composition of the grown crystal is close to the stoichiometric ratio. The blue holographic properties were also measured by the two-wave coupling experiments. As a result, in the near stoichiometric Zr:Fe:LiNbO3 crystals, photorefractive response speed, recording sensitivity, and two-wave coupling gain coefficient are significantly enhanced. Meanwhile, the high saturation diffraction efficiency is still maintained. These findings prove that the material of near stoichiometric Zr:Fe:LiNbO3 crystals are a promising candidate for blue photorefractive holographic recording. |
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