Ce：BaTiO3晶体自泵浦相位共轭特性和机理研究

在Ｃｅ：ＢａＴｉＯ３晶体中，实现了受激折变散射自泵浦相位共轭，给出了其自泵浦相位共轭形成的特点以及相位共轭波输出特性。比较了不同波长的入射光对自泵浦的形成特点和共轭波输出特性的影响。     

BaTiO3自泵浦相位共轭镜

首次报道用国产光折变晶体BaTiO_6制成的反射率大于30%的自泵浦相位共轭镜(SPPCM).并使用它成功地完成了畸变像复原实验.文中给出了自泵浦相位共轭信号的建立与入射光强度.入射光和晶体晶轴夹角的依赖关系及其擦洗速率的实验结果.文中还首次提出了一种使用单块BaTiO_3晶体,使多束入射光同时获得各自相位共轭波的方法.     

积分球腔内BaTiO3：Ce晶体的自泵浦相位共轭增强现象的观测

报道了聚四氟乙烯积分球腔内光折变晶体ＢａＴｉＯ３：Ｃｅ在Ｈｅ－Ｎｅ激光作用下产生自泵浦相位共轭的增强现象，并对实验结果进行了分析。     

异型BaTiO3自泵浦相位共轭镜实验研究

本文首次演示了一种高效异型BaTiO_3自泵浦相位共轭镜,用该相位共轭镜的45°角和135°角切面获得其共轭反射率分别大于60％和40％,文中还给出了其它实验结果和结论。     

用自散焦介质观测Ce：BaTiO3晶体的自泵浦相位共轭频移

提出利用自散焦介质作为载体测量光折变晶体自泵浦相位共轭的微小频移的新方法，适宜用于区分二波耦合，四波辊频对频移的贡献，为研究光折变自泵浦相位共轭频移的产生机制提供了一种新的可能的途径。     

光折变Ni：KNbO3晶体近红外波段自泵浦相位共轭特性的实验研究

在光折变Ｎｉ：ＫＮｂＯ３晶体中，在波长７２５ｎｍ处获得４３％的自泵浦相位共轭反射率输出，在波长８３１．４ｎｍ处共轭反射率仍可达１％。     

Ce：KNSBN晶体中产生的双泵浦相位共轭

首次报道在Ｃｅ：ＫＮＳＢＮ晶体中产生的“双”泵浦相位共轭现象，同时还观察到由同一“双”泵浦相位共轭光路所产生的自泵浦相位共轭和四波混频现象。     

用He—Ne激光在KNSBN晶体中实现高反射率自泵浦相位共轭

本文报道了用He-Ne激光在(K_(O.5)Na_(0.5)_2y(Sr_(0.61)B_(0.39)))_(1-y)Nb_2O_6(KNSBN)光折变晶体中实现高反射率自泵浦相位共轭,其共轭光的反射率高达40%.研究了共轭光反射率随入射角度变化的关系以及响应时间与入射光功率密度的关系.     

采用自泵浦相位共轭镜的光学关联存储器

本文报道了一种采用自泵浦相位共轭镜作为取阈,反馈器件的光学关联存储系统,该系统采用He-Ne激光作为光源,可实现实时处理.当输入信息仅为存储信息的25%时,得到了正确的输出.     

利用预置光栅的脉冲信号光自泵浦相位共轭特性研究

针对光折变晶体响应慢的问题,提出了一种预置光栅技术,该预置光栅可由另外的独立预置光源产生.通过对采用预置光栅的光折变晶体自泵浦相位共轭特性及其物理机制进行的实验研究证实,采用预置光栅技术可以大大缩短低重复频率、窄脉冲信号光的光折变自泵浦相位共轭的响应时间,因此对于低重复频率、窄脉冲光的自泵浦相位共轭应用有重要的实用价值.     

Coexistence of Self-pumped Phase Conjugation and Mutual-pumped Phase Conjugation in Ce:BaTiO3

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Study of the Frog-legs Phase Conjugator in BaTiO_3

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Ce:BaTiO3晶体中两个深陷阱能级引起的光折变光栅暗衰减特性

对Ce:BaTiO3晶体中光折变光栅的暗衰减特性进行了实验研究，观测到了晶体禁带中的Fe离子和Ce离子两个深陷阱能级同时参与了光折变过程。在单深能级模型和浅－深能级模型的基础上，提出了简化的双深能级模型，并根据该模型定量地分析了Fe离子和Ce离子每个深陷阱能级在不同光栅波矢、不同光栅写入光强时对总空间电场以及光折变光栅的贡献。     

Beam Profile Improvement of a LD Array by an External Cavity with Photorefractive Phase Conjugate Mirror

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BaTiO3晶体自抽运相位共轭特性研究

研究了多种Rh:BaTiO₃和Ce:BaTiO₃晶体样品的受激背向光折变散射自抽运相位共轭特性和响应时间特性.结果表明,入射光与晶体a面或b面法线的夹角较大时,自抽运相位共轭光有更高的反射率、更快响应时间.利用前向二波耦合特性和相向二波耦合特性对实验现象给予合理的解释.实验结果表明,多数Ce:BaTiO₃晶体比Rh:BaTiO₃晶体的共轭光反射率高. 关键词： 钛酸钡晶体 二波耦合 自抽运相位共轭 响应时间     

Anomalous behaviour of long-time increase in diffraction efficiency of photorefractive grating in Ce：BaTiO3 in dark

Anomalous long-time increase of the diffraction efficiency is observed in dark-decay experiments of photorefractive gratings in Ce：BaTiO3. It is deduced that a phase-conjugate beam is induced by the writing beam at acute angle to the ＋c axis of the crystal and it interferes with the other writing beam to form a second grating which is perpendicular to the first grating formed by the interference between two writing beams. The rising behaviour of the diffraction efficiency results from the different decay rates of these two photorefractive gratings. Furthermore, a simplified model of two gratings, both induced by two deep traps, is proposed to account for this phenomenon and the fitting results agree well with the experimental results.     

Effect of Self-Pumped Phase Conjugation Feedback from a Ce:BaTiO3 Crystal on Lasing Spectrum of a Laser Diode

The effect of self-pumped phase conjugation (SPPC) feedback from a Ce:BaTiO₃ crystal on the lasing spectrum of a commercial laser diode was experimentally investigated, and dependence of the spectrum on the length and reflectivity of the external SPPC cavity was studied. Experimental results showed the optimum reflectivity of the external cavity to be 0.2% for our experimental setup.     

The Comparison of the Holographic Storage Properties of Fe:LiNbO3 and Fe:Ce:LiNbO3 Crystals

Holographic storage properties of iron-doped and cerium/iron-doped LiNbO3 with different doping concentrations and treatment conditions have been measured for different recording wavelengths. The results show that at recording wavelengths of 532 nm and 633 nm the holographic storage properties of Ce:Fe:LiNbO3 are generally better than those of Fe:LiNbO3.