Abstract
A practical method of suppressing photovoltaic noise in photorefractive iron doped lithium niobate crystals (Fe: LiNbO 3 ) is proposed, in which the surfaces of the crystal are coated with transparent electric-conductive material (In 2 O 3 doped stannum, ITO) forcing the crystal to operate in a short-circuit mode. In order to assess the validity of this method, the loss of signal-to-noise ratio (LSNR) was used to evaluate the quality of images formed directly through uncoated and ITO- coated crystals respectively. Several iron doped lithium niobate crystals were measured. The main experimental results showed that the scattering noise decreased obviously in the ITO-coated crystals, suggesting that the short-circuit operation suppressed photovoltaic noise effectively. Furthermore, it is found that the dynamic range (M#) of the crystals increased after they were coated with ITO. The results of experiments on multiple hologram recordings in the uncoated and ITO-coated Fe: LiNbO 3 crystal verified the improvement of M# well.
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