Characterization of the pinhole diffraction based on the waveguide effect in a point diffraction interferometer

Wang Chen; Yang Yongying; Li Yao; Chen Yuankai; Bai Jian

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Characterization of the pinhole diffraction based on the waveguide effect in a point diffraction interferometer

机译：基于点衍射干涉仪的波导效应的针孔衍射表征

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The nearly ideal spherical wavefront generated by pinhole diffraction is the key factor determining the achievable accuracy in point diffraction interferometers (PDIs), as it is employed as the reference wavefront. A comprehensive characterization of the diffraction of a pinhole at the operating-wavelength scale that is normally adopted in PDI is given. The incident light is coupled into the pinhole, which functions as a cylindrical waveguide, and is diffracted in the end. The field in the pinhole is analyzed based on mode theory and the diffraction wave in the far field is derived from the field equivalence principle. The diffraction wave is characterized by the light transmittance, the polarization, and the wavefront aberration, which are all determined by the properties of the mode in the pinhole. The diameter of the pinhole should not be smaller than 0.6. to make the transmittance sufficient. With a linearly polarized incident light, the diffraction wave is elliptically polarized, and the wavefront aberration is dominated by the astigmatic component. The method explicitly reveals the physical mechanism of pinhole diffraction. The analytic solutions are fast to compute, easy to analyze, and intuitively show the diffractive properties of the pinhole. The conclusions are significant for insight into the nature of pinhole diffraction and provide theoretical reference for analysis of numerical results and the design of PDI systems. (C) 2018 Optical Society of America

机译：由针孔衍射产生的近乎理想的球形波前是确定点衍射干涉仪（PDIS）中可实现的精度的关键因素，因为它被用作参考波前波前。给出了通常在PDI中通常采用的操作波长刻度的针孔衍射的综合表征。入射光耦合到针孔中，该针孔用作圆柱形波导，并且终点衍射。基于模式理论分析针孔中的磁场，并且远场中的衍射波来自现场等效原理。衍射波的特征在于光透射率，偏振和波前像差，它们都是由针孔中模式的性质确定的。针孔的直径不应小于0.6。使透射率充分。利用线性偏振的入射光，衍射波是椭圆偏振的，并且波前像差由散形组分支配。该方法明确揭示针孔衍射的物理机制。分析溶液快速计算，易于分析，直观地显示针孔的衍射性质。结论是对针孔衍射性质的洞察的重要性，并为分析数值结果和PDI系统的设计提供理论参考。（c）2018年光学学会

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来源
《Applied optics》 |2018年第4期|共7页
作者
Wang Chen; Yang Yongying; Li Yao; Chen Yuankai; Bai Jian;
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Zhejiang Univ Coll Opt Sci &

Engn State Key Lab Modern Opt Instrumentat 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Opt Sci &

Engn State Key Lab Modern Opt Instrumentat 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Opt Sci &

Engn State Key Lab Modern Opt Instrumentat 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Opt Sci &

Engn State Key Lab Modern Opt Instrumentat 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Opt Sci &

Engn State Key Lab Modern Opt Instrumentat 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

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Characterization of the pinhole diffraction based on the waveguide effect in a point diffraction interferometer

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