Diffraction of Laser light from a circular aperture in a transparent plate

Mahmoudi, Ali

doi:10.22055/jrmbs.2025.20192

Diffraction of Laser light from a circular aperture in a transparent plate

Document Type : Full length research Paper

Author

Ali Mahmoudi

Department of Physics, Faculty of Science, University of Qom, Qom, Iran

10.22055/jrmbs.2025.20192

Abstract

In this study, we investigate light diffraction from a circular phase step, which is a circular aperture created in a transparent plate. The distribution of the scattered light amplitude in a plane at an arbitrary distance is derived, and the change of the diffracted intensity profile with respect to propagation distance is investigated. The difference between this type of diffraction and the diffraction of light from an aperture in an opaque plate is also described. One of the important aspects of this problem is its relevance to particle sizing methods based on laser diffraction, which assume that particles are light-absorbing disks, while transparent particles have not yet been investigated. Furthermore, in optical imaging systems, Rayleigh's criterion is defined by using the results of light diffraction from absorbent bodies to determine the resolution limit. However, as far as we know, no study has been done to check the case of microscopic transparent bodies.

Keywords

Wave optics

Diffraction

Circular phase step

optical measurement

Subjects

optic-laser

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