摘要
导出了描述夫琅和费衍射的正确公式,讨论了菲涅耳衍射和夫琅和费衍射的物理意义、两者间的逻辑关系,以及倾斜因子k(θ)对衍射花样的影响。指出一些傅里叶光学文献中的“菲涅耳衍射公式”和“夫琅和费衍射公式”均只能在观察距离z不太小也不太大的近轴范围内近似成立,z越大成立的角范围越小,当z趋向于∞时,成立的角范围趋向于零。
A correct formula describing Fraunhofer diffraction is obt ained.The physical significance and the logical relation of the Fresnel diffract ion and the Fraunhofer diffraction,along with the influence of inclination facto r on diffraction pattern are discussed in detail.It is pointed out that the “Fr esnel diffraction formula” and the “Fraunhofer diffraction formula” are only approximately satisfied for paraxial region at an observing distance z which is neither too small nor too large.The larger z is,the smaller the angle scope θ 0max of application is .When z→∞,θ0max→0.
出处
《应用激光》
CSCD
北大核心
2000年第1期16-20,共5页
Applied Laser
关键词
菲涅耳衍射
夫琅和费衍射
近似描述
衍射花样
Fresnel diffraction, Fraunhofer diffraction, approximat e description