共查询到17条相似文献,搜索用时 78 毫秒
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用相因子判断法分析条形余弦光栅衍射场 总被引:4,自引:0,他引:4
基于波前相因子判断法并考虑到光栅孔径的影响,揭示了余弦光栅的衍射场所含基元成分.给出了各基元成分衍射场的积分表达式,进而导出了像面上光强分布的公式,并显示了相应的沿轴线的光强分布曲线,得到各焦斑的半值线宽公式.本研究为余弦光栅用于空间滤波和光学信息处理技术提供了一个理论基础. 相似文献
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相因子判断法分析菲涅耳波带片的衍射场 总被引:1,自引:0,他引:1
基于波前相因子判断法,并考虑到波带片孔径的影响,揭示了波带片的衍射场所含基元成分及各成分在衍射场的积分表达式,并导出了沿轴的衍射场振幅分布公式及沿轴的振幅分布曲线,得到多个实焦斑的横向半值线宽和轴向半值线宽公式.本研究为波带片作为一种光学元件提供了一理论基础. 相似文献
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菲涅耳衍射和分数傅里叶变换 总被引:2,自引:0,他引:2
介绍了衍射孔的菲涅耳衍射和分数傅里叶变换的对应关系,使得可以用分数傅里叶变换来描述光电原始光场经过菲涅耳衍射区一直到无穷远处夫琅禾费衍射区的自由空间标量衍射传播全过程。 相似文献
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菲涅耳衍射与夫琅禾费衍射公式对自由传播问题的自洽性 总被引:2,自引:2,他引:0
考察了菲涅耳衍射积分公式和夫琅禾费衍射积分公式在处理相继自由传播问题中的行为,证明了只要注意近似条件的正确运用,这些公式对自由传播问题可以给出自洽的结果;同时讨论了菲涅耳公式中当λz→0时的极限情况及其物理意义。这些分析对于加深对两个公式的物理意义、运用条件及有效性的理解是有益的。 相似文献
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T. Asakura 《Optics Communications》1973,8(1):33-36
The intensity distribution in the Fresnel diffraction pattern of a slit aperture illuminated with partially coherent light is obtained, as a function of the coherence condition across the aperture, by evaluating the formula developed in a previous paper. It is shown that the Fresnel diffraction pattern is affected by the coherence condition of illumination across the aperture and its form. 相似文献
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The “classical” problem of plane-wave diffraction by a circular opening is inspected with one particular interest to check the existence of axial zeroes of amplitude, which can produce a specific type of phase singularities. We investigate the problem using paraxial and nonparaxial solutions of scalar wave equation based on Hankel transform. The main result of investigation is the detection of the absence of any exact amplitude zeroes in the Fresnel diffraction field. Instead, sharp phase variations localized at the regions of axial amplitude minima with longitudinal and transversal dimensions of the order of one wavelength are revealed. These phase variations influence on the phase velocity, which drops up to c/2 in the point of axial amplitude minimum. Also, superluminous effects of wavefront propagation are discussed. 相似文献
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In Glauber's theory of high energy scattering the wavefunction inside the nucleus is given by geometrical optics. The theory is extended to lower energies by incorporating the effects due to Fresnel diffraction, and applied to elastic and inelastic scattering off deuterium. 相似文献
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K.H. Müller 《Ultrasonics》1987,25(6):335-337
Inhomogeneous waves running along concave surfaces shed homogeneous pressure and shear waves governed by continuous directional spectra. The quantification of diffraction based upon conservation of energy and momentum permits ray modelling. 相似文献