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COMPETITION BETWEEN SELF-PUMPED AND MUTUALLY-PUMPED PHASE CONJUGATIONS IN A BaTiO3 BRIDGE PHASE CONJUGATOR 下载免费PDF全文
This paper reveals the inter-dependence and the competition between self-pumped and mutually-pumped phase conjugations, and deals with the periodic instabilities in the phase conjugate output of a BaTiO3 bridge phase conjugator. It presents experimental data demon-strating these instabilities and also gives evidence that the addition of the second heam in a bridge phase conjugator can affect the self-pumping threshold for the first beam. A mathe-matical model is developed to explain the observed output oscillations. 相似文献
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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 相似文献
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A CONTINUOUS COMPOUND FOUR-WAVE MIXING MECHANISM FOR SELF-PUMPED PHASE CONJUGATION IN BaTiO3 CRYSTALS 下载免费PDF全文
A continuous compound four-wave mixing mechanism for sell-pumped phase conjugation in photorefractive crystals is presented. The coupled-beam equations of this mechanism are solved numerically when depletion of the forward going beam is neglected. The experiment in a Ce-doped BaTiO3 crystal is performed, with the stable phase conjugate reflectivity of as much as ≥80%. The curved high output phase conjugate intensity are explained using the numerical results. 相似文献
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从声子-电磁激元频率色散关系的普遍公式出发,推导出了单轴晶体的Merten方程和电磁激元的频率色散关系。测量了BaTiO3和Ce:BaTiO3晶体的简正模和斜声子的喇曼散射谱,并根据Merten方程,拟合出了斜声子的方向色散曲线;记录了A1类电磁激元在不同波矢值下的喇曼谱,观察到其频率色散现象.根据以上结果,对A1(TO)模喇曼谱中两个宽的非对称峰的归属和BaTiO3晶体的结构相变机制进行了讨论;计算出了这两种晶体的受夹介电常数;分析了掺Ce对BaTiO3晶体结构的影响。
关键词: 相似文献
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实验发现在保持入射到晶体表面的泵浦光斑尺寸不变的条件下,随泵浦光的入射位置和入射角不同,自泵浦相位共轭形成机制在FWM-TIR、FWM-SPB和FWM-TIR与FWM-SPB之间转变. 相似文献
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用固相反应法、X射线粉末衍射技术和复平面阻抗谱测量研究了BaF2-BiF3系统的相组成和离子电导。在此系统中发现了两种类型的Ba1-xBixF2+x固溶体:萤石型(0s≈0.5(141/2)aF,cs<
关键词: 相似文献
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实验发现当光入射到晶体表面的泵浦光斑尺寸较小时,无论入射角和入射位置怎样,擦除光对相位共轭反射率没有影响,同时从上表面可观察到全内反射的光回路,所以SPPC的形成机理为FWM-TIR;当入射到晶体表面的泵浦光斑尺寸较大时,在一定的入射角和入射位置,擦除光的作用使相位共轭反射率很快减小,表明这时的SPPC的形成机理为FWM-SPB. 相似文献
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O. Sueoka 《Physics letters. A》1973,43(5):459-460
The angular correlation of 2 γ-annihilation radiation has been measured in barium titanate single crystals. The effect on the angular correlation of the ferroelectricity in BaTiO3 was not detected. 相似文献
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用干涉仪的方法测量了Ce:BaTiO3晶体的低频电光系数和压电系数.排除压电效应对光通过晶体引起相位的变化,得到低频下经极化的Ce:BaTiO3单晶的电光系数r42=1945±220pm/V和r13=11.8±1pm/V.从而,为研究Ce:BaTiO3晶体的光折变效应和理论计算提供了精确的线性电光系数
关键词: 相似文献
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用脉冲激光沉积技术制备了掺杂纳米金属颗粒Au或Fe的BaTiO3复合薄膜.用透射电子显微镜和x射线光电子能谱表征了金属颗粒的形态和化学态.330—800nm范围的吸收谱研究表明,掺Au颗粒的BaTiO3薄膜在580nm附近有一个明显的共振吸收峰,而掺Fe颗粒的BaTiO3薄膜没有这样的吸收峰.用Mie散射理论对结果进行了分析.
关键词:
复合薄膜
金属颗粒
脉冲激光沉积
吸收谱 相似文献
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In melt-grown BaTiO3 single crystals steady-state photocurrents proportional to the light intensity have been observed parallel to the crystallographic c-axis. The open-circuit photovoltage exceeds the value of the band gap. Light polarized parallel and perpendicular to the c-axis respectively produces photovoltages with opposite sign. This photovoltaic effect is restricted to the ferroelectric phase. 相似文献
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Critical scattering of X-rays in a BaTiO3 monocrystal was measured around the [005] reciprocal lattice point. The constant intensity curves in reciprocal lattice space are exactly analogous with those determined by Yamada et al. around the [200] point. 相似文献
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