光场空间相干性的测量方法及比较

基金项目: 国家高技术研究发展计划(863计划)资助项目(No.2013AAXXX1003X)

Measurement methods of optical spatial coherence and their comparison

Changchun Institute of Optics, Fine Machines and Physics, Chinese Academy of Science, Changchun 130033, China

摘要: 本文归纳了基于分波前干涉原理的具有代表性的干涉测量方法——杨氏双孔干涉法、逆波前杨氏干涉法和非冗余孔径阵列干涉测量法,以及基于分振幅干涉原理的干涉测量方法——自参考干涉测量法;介绍了各种测量方法的工作原理、实验配置;比较了4种测量方法的优缺点,并给出每种方法的最佳应用领域。本文结论可为根据对空间相干性测量的不同要求,选择合适的测量方法提供初步参考。
- 空间相干性 /
- 杨氏干涉法 /
- 逆波前杨氏干涉法 /
- 非冗余孔径干涉法 /
- 自参考干涉法
Abstract: This paper concluded measurement methods based on wavefront splitted principle such as Young interference method, reversed-wavefront Young interference method, nonredundant array interference method and measurement methods based on amplitude splitted principle such as self-referencing interference method. Their basic principles and experimental setup were introduced, and then the merits and defects of these methods were compared, and then the best applied field of each method was put forward. The conclusion of this paper could be used as elementary guidance for different demands of spatial coherence measurement to choose proper methods.
- spatial coherence /
- Young interference method /
- reversed-wavefront Young interference method /
- nonredundant array interference method /
- self-referencing interference method

图 1 杨氏双孔干涉法

Figure 1. Young interference method by two holes

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图 2 逆波前杨氏干涉法

Figure 2. Reversed-wavefront Young interference method

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图 3 3种不同的非冗余孔径阵列布局

Figure 3. Three different distributions of nonredundant array method

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图 4 非冗余孔径法实验示意图

Figure 4. Experimental scheme of nonredundant array method

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图 5 干涉图和傅里叶变换图

Figure 5. Interferogram and Fourier spectrum

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图 6 横截面内的相干性分布

Figure 6. Coherence distribution in cross section

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图 7 自参考干涉法实验示意图

Figure 7. Experimental scheme of self-referencing method

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图 8 完全相干场和部分相干场的模值分布

Figure 8. Modulus distribution of completed coherent field and partial coherent field

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表 1 源种干涉测量方法的比较

Table 1. Comparison of four interference methods

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