Abstract
We explain the origin of recently reported dark parametric holographic scattering patterns observed in photorefractive strontium–barium niobate (SBN) and barium–calcium titanate (BCT) crystals. Taking into account the model for parametric four-wave-mixing processes in photorefractive crystals, exponential gain factors are presented for the scattering patterns and compared with the gain for the scattering background. We interpret the dark scattering patterns as a result of counteracting energy-transfer processes.
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