排序方式: 共有6条查询结果,搜索用时 31 毫秒
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在光学教学中,每当讲到光的干涉部分时总有学生要问:干涉场中的能流密度是如何分布的?具体到杨氏双缝干涉,一条缝光源单独存在时,屏上各点的光强均为I,为什么两条相干缝光源同时存在时屏上干涉相消处的光强为零、干涉相长处的光强为4I?干涉场中的能流与按几何光学方法计算的能流是否相等? 上述问题的提出,反映了学生对干涉现象与几何光学中能流密度分布的概念之间的矛盾没有得到解决感到不满足,希望能够对此给予说明.本文将从麦克斯韦电磁理论出发,通过定性地讨论干涉场中场强和能流的传播、定量地讨论干涉远场中能流密度的分布,来阐述干涉… 相似文献
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A geometry model for tortuosity of tortuous streamtubes in porous media with spherical particles is proposed based on the assumption that some particles in a porous medium are unrestrictedly overlapped and hence of different configurations. The proposed model is a function of porosity with no empirical constant imposed on it.The model predictions are found to be in good agreement with the available experimental data. 相似文献
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本文研究粒子压缩态光场参与的和频过程中各输出的光场的量子统计特性。我们导出各输出光场和总输出光场的归一化量子噪声(Fano因子)随有效相互作用长度而变化的规律,发现非线性光学过程输入场的量子噪声变大,使和频光场的量子噪声变小,显示输入光场的统计性质的特点部分地转移和频光场。 相似文献
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We investigate the quantum statistics of the fields produced in second harmonic generation when photon number squeezed light ia used as input. It is found that the squeezed properties of the pump beam can be transferred to a certain extent to the second harmonic beam. The normalized photon fluctuations, or Fano factors, of the fundamental and second harmonic output fields are derived for various values of the interaction parameters. 相似文献
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