Abstract
A high sensitivity and large dynamic range are observed in LiNbO3 : Fe : Cu and In-doped LiNbO3 : Fe : Cu crystals at 488 nm wavelength based on the two-beam coupling experiment. The strong blue photorefraction is contributed by the two-centre effect and the remarkable characteristic of being in phase between the two gratings recorded in shallow and deep trap centres. The sensitivity S is measured up to 6.24 cm J−1, and simultaneously the dynamic range M/# is achieved to 34.2 in the In-doped LiNbO3 : Fe : Cu crystal, which are enhanced significantly as compared with those of the LiNbO3 : Fe : Cu crystal under the same experimental conditions. The damage-resistant dopants such as In3+ ions are no longer damage resistant, but they enhance the photorefractive properties at 488 nm wavelength. Experimental results definitely show that In-doped two-centre LiNbO3 : Fe : Cu crystal is a promising candidate as a blue photorefraction material for volume holographic storage.
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