Prescription for optimizing holograms in LiNbO(3):Fe:Mn.
The photorefractive holographic dynamics of grating formation in photochromic doubly doped LiNbO(3):Fe:Mn crystal is studied numerically and analytically in terms of the two-center model of Kukhtarev et al. [Ferroelectrics 22, 949 (1979)]. The relations among the recorded and fixed space-charge fields and the doping densities, the oxidation-reduction states of the fields, and the intensities of UV-sensitizing and red recording beams are studied. Important conditions and effects are found, and an optimal prescription for material doping and oxidation-reduction processing is suggested in which the crystal can be strongly oxidized and the Mn-doping density is smaller than the Fe-doping density.
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