共查询到17条相似文献,搜索用时 358 毫秒
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Ce:BaTiO3晶体自泵浦相位共轭特性和机理研究 总被引:4,自引:1,他引:3
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。 相似文献
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Ce:KNSBN晶体中产生的双泵浦相位共轭 总被引:2,自引:0,他引:2
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。 相似文献
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用自散焦介质观测Ce:BaTiO3晶体的自泵浦相位共轭频移 总被引:2,自引:1,他引:1
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。 相似文献
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KNSBN:Co晶体的无外场自泵浦相位共轭 总被引:2,自引:2,他引:0
利用掺Co:(KNa)_(0.2)(Sr_(0.75)Ba_(0.25))_(0.9)Nb_2O_6晶体实现了无外场,无外反射镜、无外加泵浦光束的自泵浦连续波相位共轭,其相位共轭反射率达到40%,阈值功率小于0.02W/cm~2,首次利用此晶体以梯形切割实现了光折变晶体单区域四波混频相互作用产生自泵浦位相共轭波. 相似文献
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从BaTiO_3晶体自泵浦相位共轭透射光束的出射角随泵浦光束入射角的变化,相位共轭透射光束在晶体中的光路,以及相位共轭透射光束的透射率随泵浦光束和晶体c轴夹角的变化等几方面研究了BaTiO_3晶体自泵浦相位共轭中的透射效应,根据实验结果肯定了自泵浦相位共轭中透射现象的存在. 相似文献
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Cu:KNSBN晶体自泵浦与互泵浦相位共轭共存特性的实验研究 总被引:10,自引:3,他引:7
利用Cu:KNSBN晶体,研究了在两束泵浦光对称入射的条件下,自泵浦与互泵浦相位共轭共存时相互竞争和相互影响的特性,以及共存时的相位共轭特性与两束泵浦光的入射位置、入射夹角和泵浦比之间的关系,并对自泵浦相位共轭反射率和两束泵浦光共同存在条件下的自泵浦相位共轭反射率进行了比较. 相似文献
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光折变晶体几何结构对自泵浦相位共轭特性影响的研究 总被引:2,自引:2,他引:0
基于Cu∶KNSBN晶体的自泵浦相位共轭实验,研究了光折变晶体的几何结构对自泵浦相位共轭特性的影响,得到在入射角不变的情况下,随着入射位置的变化相位共轭光输出有最大值,几何结构不同最大值输出对应的位置不同.并从理论上分析了晶体结构在双作用区自泵浦相位共轭机制中的作用,指出几何结构、入射位置与自泵浦光通道、耦合系数的关系及在自泵浦相位共轭效应中存在一个最佳入射光工作位置. 相似文献
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BaTiO3自泵浦相位共轭镜 总被引:1,自引:1,他引:0
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. 相似文献
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The details of experiments showing the effects of self-pumped phase conjugation on reflection and on transmission in barium
titanate crystal are given. The specular reflection and the second-surface reflection of an extraordinary polarized beam,
incident on the face of the crystal parallel to itsc-axis, get reduced in intensity as the phase conjugation develops. It has been found that parts of the self-pumped phase conjugate
beam emerge out of the crystal as additional transmission beams. They grow in intensity as the phase conjugation develops.
Other measurements which combine coherent or incoherent coupling beams are presented and used to explain the observations. 相似文献
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基于两块不同尺寸的Cu∶KNSBN晶体自抽运相位共轭实验,研究了光折变晶体的几何结构及入射角度对自抽运相位共轭特性的影响,得到在入射位置不变化的情况下,随着入射角度的变化相位共轭光输出有最大值,几何结构不同对应的最大值不同。并从理论上分析了晶体结构及入射角度在双作用区自抽运相位共轭机理中的作用,指出几何结构、入射角度与自抽运光通道、耦合系数的关系,及在自抽运相位共轭效应中存在一个最佳入射角度,这时相位共轭光输出最大。最后,对理论上的相位共轭反射率公式进行了修正。对自抽运相位共轭实际应用中,选择最佳入射角度提供了理论和实验依据。 相似文献
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Chi Ching Chang 《Optical Review》1997,4(5):556-560
We demonstrate the simultaneous phase conjugation of multiple beams incident on the a face of a photorefractive barium titanate crystal. The input beam power, angle and position were set so that no phase conjugation occurs unless a switchable incoherent inducing beam is present on the — c face of the crystal. The use of the inducing technique with two mutually pumped phase conjugations for four input beams, or one self-pumped and one mutually pumped phase conjugation for three input beams can be performed in a crystal. Unlike the setup of conventional phase conjugation, which requires more precise arrangements, the novel setup of the multi-beam induced phase conjugation is relatively relaxed. The mechanism responsible for our discovery is qualitatively explained, and possible applications are mentioned. 相似文献
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The directional scattering in photorefractive SBN crystal is reported.The self-pumped phase conjugation has been realized with the feedback of this directional scattering andthe performance parameters are compared with those of cat self-pumped phase conjugator. 相似文献
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Self-pumped phase conjugation in a cerium-doped barium titanate crystal pumped with femtosecond laser pulses at a 1053 nm wavelength was experimentally studied. A reflectivity of a self-pumped phase conjugation as high as 15#x0025; was demonstrated. 相似文献
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We present self-pumped phase conjugation experiments in a ring cavity at 1.06 μm in a BaTiO3:Rh crystal both in the cw and in the nanosecond regime. The measured reflectivities are respectively 50% and 66%. At 4 W cm−2 of cw illumination, it only takes 90 s to reach the steady state. A preliminary experiment of correction of the focusing effect of a lens is reported. 相似文献