The dynamics of holographic storage in doubly doped LiNbO3 : Fe : Mn

Considering the three transport mechanisms of diffusion, drift and the phot ovoltaic effect, we set up a set of coupling differential equations that de scribe the dynamics of the two-color holographic storage in doubly doped Li NbO3:Fe:Mn in the case of small signal and modulation, and solve the equati ons to explain the time dynamic development process of holographic storage by using the numerical calculation method. On the basis of these results, w e analyze the effect of oxidation-reduction on the process of holographic s torage, the non-volatile holographic storage is realized only if the sum N- a of number density of the accepters (Fe3+ and Mn3+) is larger than the num ber density of iron ions N-2. Diffraction efficiency of fixed grating incre ases with oxidation, photorefractive sensitivity decreases with oxidation, higher diffraction efficiency is at the cost of lower photorefractive sensi tivity. When the concentration of doped iron is constant, the higher the co ncentration of doped manganese, the larger the effective dynamic range of s tate of oxidation-reduction is, in which holograph can be saved permanently .