| 1. | Propagation equation of optical solution in nonlinear medium
光孤子在非线性介质中的传输 |
| 2. | This theory is also a good method for studying propagation properties of the gaussian beam passing through the nonlinear media
这种理论方法也是研究高斯光束通过非线性介质后传输特性的一种很好的方法。 |
| 3. | The historical review is given about the research on the induced focusing of optical beams in self - defocusing nonlinear media
在此基础上对三维自散焦介质中由交叉相位调制效应诱导的光束聚焦进行系统研究。 |
| 4. | In this , we focus on the phenomena of the induced focusing when two beams propagation in self - defocusing nonlinear media in an off - axis geometry
本论文旨在研究三维自散焦介质中由交叉相位调制效应诱导的光束聚焦。 |
| 5. | The paper is organized as follows : chapter 1 , we present an overview of recent advances in the research of optical beam propagating in nonolocal nonlinear media and generalize the definition of strong nonlocality
本论文共分四章，主要类容如下：第一章，介绍了近几年来关于非局域介质中光束传输理论的研究进展，推广了强非局域的概念。 |
| 6. | Taking into account the boundary conditions , two results were gotten : 1 ) the nonlinear medium provides gain to small ripples which is beyond the bespalov - talanov cutoff spatial frequency ; 2 ) large ripples can also get large gain
而考虑边界条件以后，出现了这样两个特征：在b - t理论截止频率以外的一些小纹波依然有一定的增益；同时大纹波也有较大的增益。 |
| 7. | Self - focusing and self - defocusing have their origin in the intensity dependence of the refractive index of the nonlinear medium . the picture becomes more complicated when two copropagating optical beams affect each other through nonlinear cross - phase modulation
当两光束共同在非线性介质中传输时，两光束由于交叉相位调制效应将会相互作用，其物理机制变的比较复杂。 |
| 8. | Abstract : numerically solving equations governing the variations of the beam size and the curvature of wave front in the logarithmically nonlinear media ( lnm ) , the propagating characteristics of gaussian beams have been described in detail
文摘:根据对数型非线性介质中高斯光束的束宽和波阵面曲率变化所满足的耦合方程，采用数值计算对高斯光束的传输特性进行了详细的分析。 |
| 9. | In chapter 2 , the basic theory on the simultaneous propagation of two optical beam in nonlinear media is given briefly , and a couple of parameters for describing the focusing of a beam are introduced as well
全文共六章，各章内容如下：第一章，介绍了自散焦介质中的光束诱导聚焦现象及其研究进展。第二章，简述了双光束传输的基本理论，并且引进了描述光束聚焦过程的几个参量。 |
| 10. | The appearance position of hot - image satisfied the rule of z2 = z1 - lv , z2 is mean the image distance , z1 is mean the object distance , and lv is mean the distance between the nonlinear medium . the theory is also validated by the optical propagation software . if n = 1 , then the nonlinear medium is only one , lv = 0 , and it will satisfy the rule z2 = z1
四、从非线性近轴波动方程基础上用散射矩阵理论推导了级联介质的热像规律,得出级联介质的热像位置满足z2 = z1 - lv ,其中z2为像距, z1为物距, lv为级联介质间的距离,并用光传输软件得到了验证;发现级联的非线性介质可以看成单一的非线性介质相连,散射点对级联介质的每一段非线性介质成像;当只有一段非线性介质时,可以认为lv为零,满足z2 = z1 。 |
