In reduced LiNbO3 : Mn both the photorefractive sensitivity and the simultaneously measured photocurrent result from drift with a polarization‐dependent effective ’’internal field’’ of about 6 kV/cm. In reduced undoped LiTaO3the observed difference in applied fields of the minimum photorefractive sensitivity and zero photocurrent imply charge transport is by a mechanism that cannot be completely described by diffusion and drift in an electric field. The direct measurement of the harmonic content of phase gratings written in several LiNbO3and LiTaO3crystals shows termination of charge‐transport results from the space‐charge field of the hologram.