对夫琅禾费圆孔衍射场基本特征的讨论

Discussion on the Basic Characters of the Fraunhofer Diffraction Field

在用远场条件下接收衍射场的装置进行夫琅禾费衍射实验,但实验结果会表现出对夫琅禾费衍射理论值的偏离,光强的极小值提高,极大值降低,振荡幅度减弱,艾里斑增大.根据菲涅耳基尔霍夫衍射公式,利用贝塞尔函数的积分表达式得出夫琅禾费衍射场的光强级数解,进而讨论了衍射场的基本特征.

Fraunhofer diffraction experiment is conducted by using a device that receives diffraction field in a far field condition does, but the result is different from the theoretic values of the Fraunhofer diffraction field. The minimum of the light strength rises, and the maximum depresses. The amplitude is weakened and the Airy Disk strengthened. According to the Fresnel-Kirchhoff diffraction formula this thesis gets the light strength progression solution of the Fraunhofer diffraction field through the integral expression of the Bessel function, and gives further discussion of the basic characters of the Fraunhofer diffraction field.