Abstract
Vectorial Kukhtarev equations modified for nonvolatile holographic recording in doubly doped crystals are analyzed, in which the bulk photovoltaic effect and external electrical field are both considered. On the basis of the small modulation approximation, both the analytic solution to space-charge field with time in recording phase and the steady-state solution in readout phase are deduced. Because bulk photovoltaic current is determined by polarized state of incident light, and refractive index change depends on not only the modulus of space-charge field but also its direction, the optimum design parameters for maximizing space-charge field are different from those for maximizing refractive index change. Therefore a trade-off exists between them. Based on the vectorial analyses of band transport model for nonvolatile holographic recording in doubly doped crystals, an optimal recording direction is given for maximizing refractive index change in doubly doped LiNbO3 :Fe:Mn crystals.
Published Version
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