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Crystal Research and Technology |
Cryst. Res. Technol. 43, 260 (2008) - Abstract -
Photorefractive features of non-stoichiometry codoped Hf:Fe:LiNbO3 single crystals
Liu Bo, Li Chunliang, Bi Jiancong, Sun Liang*, and Xu Yuheng*
School of Chemistry and Environment Engineering, Harbin University of Science and Technology, Harbin 150040, China
*School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
| Keywords | Hf:Fe:LiNbO3, photorefractive effect, exponential gain coefficient |
| PACS | 91.60.Mk |
| DOI | 10.1002/crat.200710965 |
Hf(2mol%):Fe(0.05wt%):LiNbO3 crystals with various [Li]/[Nb] ratios of 0.94, 1.05, 1.2 and 1.38 have been grown. The photorefractive resistant ability increases with the accretion of [Li]/[Nb] ratio. When the ratio of [Li]/[Nb] is 1.20 or 1.38, the OH- absorption band shifts to about 3477cm-1. The mechanisms of the photorefractive resistant ability increase and the absorption band shift have been discussed. The exponential gain coefficient (Γ) of the crystals was measured with two-beam coupling method and the effective charge carrier concentration (Neff) was calculated. The results show that Γ and Neff increase with the accretion of [Li]/[Nb] ratio. The temperature effect of codoped Hf:Fe:LiNbO3 crystals was also studied, it was found that the exponential gain coefficient increase dramatically at about 55°C, 70°C and 110°C, this is due to the inner electric field which is resulted from structure phase change.
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