Diffraction property of an axicon in quasi-monochromatic light
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摘要: 为了研究准单色光照射轴锥镜的衍射特性,在讨论单色平面波照射轴锥镜衍射理论的基础上,利用准单色光可以分解为不同频率单色光线性组合的特性,得到了准单色光照射轴锥镜的衍射光斑的强度分布形式。并根据仿真和实验结果比较了准单色光和单色光产生的衍射光斑强度分布的差异。结果表明,准单色光照射轴锥镜产生的衍射光斑的强度为不同频率单色光照射轴锥镜产生的强度之和,衍射条纹数比单色光的少,离轴方向的光强比单色光的衰减快。Abstract: For analyzing the diffraction property of an axicon in quasi-monochromatic illumination,based on the analyses of the diffraction property of an axicon illuminated by a monochromatic plane wave and the property of quasi-monochromatic light that it can be regarded as superposition of monochromatic components of differential frequencies,the intensity distribution of the diffraction pattern of an axicon in quasi-monochromatic light was deduced.According to the numerical simulation and experimental results,the difference between the diffraction patterns generated by quasi-monochromatic light and monochromatic light was compared.Results show that the intensity distribution of an axicon in quasi-monochromatic light is given by the sum of intensity of individual component,and the diffraction fringes are less than those produced by monochromatic light.Moreover the off-axis intensity attenuates more rapidly than that of monochromatic waves.
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Keywords:
- optical devices /
- intensity distribution /
- diffraction /
- axicon /
- quasi-monochromatic light
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