Abstract
In this paper, we have investigated the grating erasure of a reduced LiNbO 3:Fe crystal with different erasing wavelengths. The overall hologram evolution in the process of grating erasure is nonexponential due to strong absorption which is contrary to the mono-exponential law. The hologram in the rear part of the crystal can persist for a long time in the grating erasure due to weak erasing light intensity by strong absorption, which can enlarge the erasure time constant. From the erasure experiments, the global absorption α d ≈ 5 can be taken as the optimum absorption to acquire a good trade-off between the sensitivity and hologram strength in the crystal.
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