Diffraction characteristics of serrated circular aperture with random radius
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摘要: 研究了半径随角度的变化而随机变化的圆孔波纹锯齿光阑的衍射特性，提出并证明半径随机的圆孔纹波锯齿光阑能改善光束的近场分布和抑制光束中央部分的衍射调制。给出了衍射光轴上和横截面内光强分布的模拟计算结果，通过计算结果可以看出:通过半径随机圆孔波纹锯齿光阑后，衍射光横截面内填充因子比经过调幅型波纹锯齿光阑后的填充因子高，调制强度比经过调幅型波纹锯齿光阑低，并且半径随机锯齿光阑能在较大的空间范围内抑制轴上光强的衍射调制, 其可抑制的最远空间距离可达0.15 m。Abstract: This paper studies the diffraction characteristics of a serrated circular aperture with random radius, and puts forward and proves that the aperture can further improve the near-field distribution of the beam and reduce the diffraction modulation in the beam center. The simulation results of the axial diffraction and the intensity distribution in the cross section are given, which shows the diffraction light after this aperture has higher filling factor and lower modulation rate compared with that after the amplitude modulation serrated aperture. The intensity modulation of Fresnel diffraction on the axis is suppressed by using the random radius serrated aperture in larger space. The farthest range of suppression can reach 0.15 m.
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