Abstract
The dependence of nonvolatile holographic recording on Ce and Cu dopant composition ratios in doubly doped LiNbO 3 crystals is investigated experimentally. Three groups of congruent LiNbO 3 :Ce:Cu crystals have been grown by the Czochralski method with the compositions of 0.085 wt % Ce 2 O 3 and 0.011 wt % CuO, 0.045 wt % Ce 2 O 3 and 0.045 wt % CuO, 0.011 wt % Ce 2 O 3 and 0.085 wt % CuO, respectively. The recording results and the transmission spectra show that the absorption characteristics of the crystals to ultraviolet light have great impact on the finally fixed diffraction efficiency, and the larger the absorption to ultraviolet light, the higher the fixed diffraction efficiency. At the same time, the dependence of the absorption characteristics to ultraviolet light of the medium on both dopant composition ratios and oxidization/reduction annealing conditions is analyzed. As a result, the weakly oxidized crystal with composition of 0.011 wt % Ce 2 O 3 and 0.085 wt % CuO has the highest fixed diffraction efficiency.
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