Abstract
In LiNbO3:Fe, anomalous behaviour of grating erasure is observedwith different wavelengths, i.e. rapid grating erasure in the shortwavelength range, which deviates from the results predicted by theelectron transport band model. The deviation is related to thecoexistence of electrons and holes in photorefraction, andcharge-transfer process including electrons and hole has been proposed.The electron and hole contributions to photoconductivity have beenidentified by experiments. We also give the theoretical dependence ofelectron photo-excitation coefficient S of the Fe centre on thewavelength.
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