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The photorefractive effects of the as-grown and proton-implanted KNbO3 crystals were studied by two-wave mixing at 62.2 μW/cm2 illumination.At this pump power level,the as-grown crystal showed little photorefractive effect,while the proton-implanted crystal showed an obvious effect.Furthermore,there seemed to exist two photorefractive gratings with response times of 22.54 and 1596.30s,at 62.2μW/cm2 pump power level,in the proton-implanted sample.This phenomenon has been attributed to the influence of proton-implantation.