Farahiyan Maryam, Aalipour Rasoul
Department of Physics, Azarbaijan Shahid Madani University, Tabriz, 53714-161, Iran.
Sci Rep. 2024 Dec 2;14(1):29896. doi: 10.1038/s41598-024-81344-8.
This research examines, using both theory and experimentation, how a light beam's spatial coherence affects a sinusoidal linear Fresnel zone plate's depth of focus. We generate a one-dimensional partially coherent Gaussian Schell-model beam from a coherent laser beam through putting a rotating diffuser near to the common focal plane of two cylindrical lenses in a 2f-system. By adjusting the beam spot size on the diffuser, one may modify the coherence width of the produced beam. Our findings demonstrate that when the coherence width of the partly coherent beam drops, the zone plate's depth of focus increases. Not only is it claimed that the experimental results validate the theoretical conclusions, but a mathematical link is also established between the experimental parameter used to manipulate the light coherence and the theoretically obtained coherence width. This topic has many applications in the field of optical, microscopy, optical trapping, imaging systems and biomedical.
本研究通过理论和实验相结合的方式，探讨光束的空间相干性如何影响正弦线性菲涅耳波带片的焦深。我们在一个2f系统中，通过在两个柱面透镜的公共焦平面附近放置一个旋转漫射器，从相干激光束产生一维部分相干高斯谢尔模型光束。通过调整漫射器上的光斑尺寸，可以改变所产生光束的相干宽度。我们的研究结果表明，当部分相干光束的相干宽度下降时，波带片的焦深增加。不仅实验结果验证了理论结论，而且还建立了用于控制光相干性的实验参数与理论获得的相干宽度之间的数学联系。该主题在光学、显微镜、光镊、成像系统和生物医学领域有许多应用。
