We propose a mathematical model for the movement in absorbing materials of photorefractive holograms under feedback constraints. We use this model to analyze the speed of a fringe-locked running hologram in photorefractive sillenite crystals that usually exhibit a strong absorption effect. Fringe-locked experiments permit us to compute the quantum efficiency for the photogeneration of charge carriers in photorefractive crystals if the effect of bulk absorption and the effective value of the externally applied field are adequately taken into consideration. A Bi12TiO20 sample was measured with the 532-nm laser wavelength, and a quantum efficiency of Phi = 0.37 was obtained. Disregarding absorption leads to large errors in Phi. (C) 2000 Optical Society of America [S0740-3224(00)00209-5].
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机译：我们提出了一种在反馈约束下吸收光折射全息图材料的运动的数学模型。我们使用该模型来分析通常呈现强吸收作用的光折变亚硅酸盐晶体中的边缘锁定运行全息图的速度。如果充分考虑了体吸收的影响和外部施加场的有效值，边缘锁定实验使我们能够计算光折射晶体中载流子的光生化的量子效率。用532nm的激光波长测量Bi 12 TiO 20样品，并获得Phi ＝ 0.37的量子效率。忽略吸收会导致大的Phi错误。 （C）2000年美国光学学会[S0740-3224（00）00209-5]。
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