Optical fixing using shallow traps -: application to La3Ga5Sio14 doped with praseodymium

The purpose of this paper is twofold. First, we demonstrate optical fixing through two-step gated recording in a crystal of La3Ga5SiO14 doped with praseodymium. Second, based on these experiments we suggest an excitation-recombination model for the photorefractive effect in the crystal and comment on the nature of the intermediate level involved in the gated recording process.