共查询到17条相似文献,搜索用时 155 毫秒
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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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Ce:Fe:LiNbO3晶体的全息存储和相位共轭特性的研究 总被引:6,自引:1,他引:5
本文用提拉法从熔体中生长了Ce:Fe:LiNbO_3晶体,并采用二波混合和简并四波混合方法研究和测试了晶体的全息衍射效率和相位共轭反射率.以Ce:Fe:LiNbO_3晶体作为存储元件和相位共轭镜,实现了光学实时全息关联存储. 相似文献
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比较了掺Fe量相同的两种晶体Fe :LiNbO3和Zn :Fe :LiNbO3的光折变性能 ,并且给出了Zn :Fe :LiNbO3晶体光电导和衍射效率与入射总光强的关系 .在Zn :Fe :LiNbO3晶体二波耦合实验中观察到衍射效率随记录时间的增长先增加 ,达到饱和后又逐渐减小的自擦除现象 ,并采用光折变双载流子四陷阱模型对该现象加以解释 .在此基础上选择合适的曝光时序 ,利用角度复用技术在该晶体中进行体全息存储 ,并在同一点上存入 30幅图像 相似文献
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比较了掺Fe量相同的两种晶体Fe:LiNbO3和Zn:Fe:LiNbO3的光折变性能,并且给出了Zn:Fe:LiNbO3晶体光电导和衍射效率与入射总光强的关系.在Zn:Fe:LiNbO3晶体二波耦合实验中观察到衍射效率随记录时间的增长先增加,达到饱和后又逐渐减小的自擦除现象,并采用光折变双载流子四陷阱模型对该现象加以解释. 在此基础上选择合适的曝光时序,利用角度复用技术在该晶体中进行体全息存储,并在同一点上存入30幅图像.
关键词:
双载流子四陷阱模型
自擦除
电子-空穴竞争
角度复用 相似文献
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研究了Ce∶KNSBN光折变类光纤在泵浦光和信号光夹角分别为小角度和大角度两种情况下简并四波混频的基本特性 .当夹角较大时 ,在光折变类光纤内部形成了两个四波混频作用区域 ,获得了比小角度情况提高 4倍的大相位共轭反射率 .给出了Ce∶KNSBN光折变类光纤中 ,在入射夹角分别为小角度和大角度两种情况下 ,相位共轭光反射率分别随信号光光强、两束泵浦光光强比变化的实验结果 ,并用理论公式进行了拟合 ,理论分析和实验结果相符 .还研究了Ce∶KNSBN光折变类光纤四波混频光栅模式和相位共轭光时间响应特性 .光折变类光纤的相位共轭响应时间较快 ,可为秒量级 . 相似文献
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首次报道四方相FeiKTN晶体的二波耦合性质.测得晶体的二波耦合增益系数和衍射效率分别为7.3cm~(-1)和42%,响应时间为2.8sec.文中还分析了主要载流子的符号并计算了其它参数. 相似文献
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Numerical simulation of four-wave mixing efficiency and its induced relative intensity noise 下载免费PDF全文
Four-wave mixing,as well as its induced intensity noise,is harmful to wavelength division multiplexing systems.The efficiency and the relative intensity noise of four-wave mixing are numerically simulated for the two-wave and the three-wave fiber transmissions.It is found that the efficiency decreases with the increase of both the frequency spacing and the fiber length,which can be explained using the quasi-phase-matching condition.Furthermore,the relative intensity noise decreases with the increase of frequency spacing,while it increases with the increase of fiber length,which is due to the considerable power loss of the pump light.This investigation presents a good reference for the practical application of wavelength division multiplexing systems. 相似文献
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理论分析和实验观测了非相干背景光辐照下掺杂LiNbO3晶体中的二波耦合,发现非相干背景光能够在很大范围内灵活有效地控制信号光增益,抑制扇形效应,提高信噪比,缩短光栅的建立时间.入射光光强比一定时,适当地增大背景光光强可以使光栅响应时间减小一个数量级.尤其对于抽运光光强远大于信号光光强的情况下,上述作用更为明显.
关键词:
光折变
二波耦合
非相干背景光 相似文献
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P. A. Prudkovskii 《JETP Letters》2003,77(7):353-357
Nonlinear dynamics of recording volume holographic gratings upon two-wave mixing in an inertial photorefractive media were studied. It is found that the space-time dependence of the grating diffraction efficiency can be quasi-regular, allowing the understanding of the experimentally observed irregular behavior of the diffracted light intensity. 相似文献
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Hao Tian Zhongxiang Zhou Dewei Gong Haifeng Wang Yongyuan Jiang Chunfeng Hou 《Optics Communications》2008,281(6):1720-1724
We report the successful growth of paraelectric potassium lithium tantalate niobate (KLTN) single crystal doped with iron. Detailed investigations have been made on the photorefractive properties of the as-grown crystal. The key parameters such as space-charge field, grating response time, photorefractive sensitivity and sign of the dominant charge carrier were obtained by two-wave mixing technique. 1.7 mm thick sample exhibits a high diffraction efficiency of 78% at the external field of 3.3 kV/cm and a sensitivity of 1.49 × 10−10E0 cm2/J. The two-wave mixing gain coefficient increases linearly with external field, and reaches a large value of 19.4 cm−1 at 4 kV/cm. Based on experimental results, iron is an effective dopant to KLTN which shows high diffraction efficiency and two-wave mixing gain coefficient. 相似文献
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TheoryofIntensityDependentTwoWaveMixingwithHighSpeedAmplitudeModulatedBeamsinPhotorefractiveCrystal¥SHEWeilong;WUQi;YUZhenxin... 相似文献