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针对90°全息记录结构的特殊性,在记录和读出阶段分别施加不同极性的外加电场,实现了Fe∶LiNbO3晶体中高衍射效率的全息记录和读出。在库赫塔列夫(Kukhtarev)方程基础上引入两维耦合波理论,对组合外加电场提高掺铁铌酸锂晶体光折变特性的机理进行了探讨。实验和理论计算结果都表明这种分别在记录和读出过程施加不同极性组合的外加电场是在Fe∶LiNbO3中实现高衍射效率90°记录结构体全息的有效技术方案。
In view of the particularity of the 90 ° holographic recording structure, an applied electric field of different polarities is respectively applied during the recording and reading phases to achieve holographic recording and reading with high diffraction efficiency in the Fe: LiNbO3 crystal. Based on the Kukhtarev equation, a two-dimensional coupled-wave theory is introduced to investigate the photorefractive properties of lithium iron niobate crystals by a combination of applied electric fields. Both experimental and theoretical calculations show that the applied electric field with different combinations of polarities respectively during recording and reading is an effective technical scheme for realizing high diffraction efficiency of 90 ° holographic recording structure in Fe: LiNbO3.