Optical Spatial Solitons in Photorefractive Materials
Optical Spatial Solitons in Photorefractive Materials
复制标题
光折变材料中的光学空间孤子
DOI：
10.1007/978-981-16-2550-3
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发表时间：
2021
影响因子：
5
通讯作者：
R. A. Yadav
中科院分区：
文献类型：
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作者：
Aavishkar Katti;R. A. Yadav
本书是我对推进包括光折变介质在内的非线性光学材料研究的真诚愿望的成果。这是一次令人满意的学术旅程，有时我们再次爱上了这个学科。当光折变效应被发现时，人们普遍认为它是有害的并且是不必要的，因为光束扇形会耦合掉能量。但很快，人们发现光折变效应在全息术、光学相位共轭、混波和光存储等方面有着巨大的应用。这些过程都是由载流子的光生作用在光折变晶体中引起的扩散效应驱动的。 20世纪90年代，人们发现光折变材料可以支持自捕获，与上述过程完全相反。贡献光生载流子电流的漂移分量的外部场可能导致由于入射光束而形成折射率波导。 Photorefractive crystals are unique because they exhibit a saturable nonlinearity, and spatial solitons can be realized in the laboratory at relatively low laser powers.通过研究光折变晶体中空间孤子的性质，通常发现了空间孤子的某些特征。这篇论文的目标读者是光学孤子领域的初级研究人员。特别是，我们对一类特殊的非线性光学晶体（光折变晶体）中的光学空间孤子进行了详细研究。在第 1 章中。 1、本章对光折变孤子进行了简洁而清晰的介绍。已通过相关示例解释了电光效应，然后解释了光折变介质中的光折变效应和自陷效应。还给出了简要的实验概述，之后我们讨论了最简单类型的光折变孤子（称为筛选孤子）的综合理论。讨论了感应空间电荷场的推导，并获得了所有三种类型孤子的归一化强度分布以及孤子宽度存在曲线。明亮、黑暗和灰色。研究了扩散对孤子传播的影响。扩散效应导致孤子轨迹自偏转，现在遵循抛物线曲线。一旦研究了最简单类型的光折变 ix
The present book has been an effort which has been fructified as a result of a sincere wish for advancement of research in nonlinear optical materials including photorefractive media. It has been a satisfying academic journey where there have been moments when we have fallen in love with the subject again. When the photorefractive effect was discovered, it was generally thought to be damaging and unwanted because of the coupling away of energy by beam fanning. But soon, it was found that photorefractive effect has tremendous applications in holography, optical phase conjugation, wave mixing and optical storage. These processes were all driven by the diffusion effect induced in the photorefractive crystal due to the photogeneration of carriers. In the 1990s, it was discovered that photorefractive materials can support self-trapping, the exact opposite of the processes mentioned above. An external field contributing a drift component of the current of the photogenerated carriers could result in an index waveguide to form due to an incident beam of light. Photorefractive crystals are unique because they exhibit a saturable nonlinearity, and spatial solitons can be realized in the laboratory at relatively low laser powers. Certain characteristics of spatial solitons in general were discovered by studying the properties of spatial solitons in photorefractive crystals. This treatise has been aimed at beginning researchers in the field of optical solitons. In particular, we have presented a detailed study of optical spatial solitons in a special class of nonlinear optical crystals, which are photorefractive crystals. In Chap. 1, a succinct but clear introduction of the photorefractive solitons has been presented in this chapter. The electro-optic effect has been explained with a relevant example which then leads to the explanation of the photorefractive effect and self-trapping in photorefractive media. A brief experimental overview has also been given after which we discuss a comprehensive theory for the simplest type of photorefractive solitons, known as screening solitons. The derivation of the induced space charge field is discussed, and the normalized intensity profiles are obtained along with the soliton width existence curves for all three types of solitons, viz. bright, dark and grey. The effect of the diffusion on the propagation of the soliton is investigated. The diffusion effect results in a self-deflection of the soliton trajectory which follows a parabolic curve now. Once the investigation of the simplest type of photorefractive ix