Forced oscillator model of dynamic spatial charge field in the reduced Zn:Fe:LiNbO3 crystal

Holographic data storage is promised to be the next-generation optical storage technology for many years. The Zn:Fe:LiNbO3 crystal is studied widely because of its promising holographic storage properties. The forced oscillator model is used to explain the self-erasing phenomenon in the reduced Zn:Fe:LiNbO3 crystals. It is showed that the total spatial charge field is dominated by two kinds of carrier with different respond time, which are electron and hole, respectively. The cooperative action of two kinds carrier induces that the total charge field non-monotonically varies with the recording time. The same diffraction efficiency of hologram with equal exposure energy is realized by the self-erasing property. The precision of the optical correlation recognition based on holographic storage will be improved.