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摘要:
Optical interference is not only a fundamental phenomenon that has enabled new theories of light to be derived but it has also been used in interferometry for the measurement of small displacements, refractive index changes, and surface irregularities. In a two-beam interferometer, variations in the interference fringes are used as a diagnostic for anything that causes the optical path difference (OPD) to change;therefore, for a specified OPD, greater variation in the fringes indicates better measurement sensitivity. Here, we introduce and experimentally validate an interesting optical interference phenomenon that uses photons with a structured frequency-angular spectrum, which are generated from a spontaneous parametric down-conversion process in a nonlinear crystal. This interference phenomenon is manifested as interference fringes that vary much more rapidly with increasing OPD than the corresponding fringes for equal-inclination interference;the phenomenon is parameterised using an equivalent wavelength, which under our experimental conditions is 29.38 nm or about 1/27 of the real wavelength. This phenomenon not only enriches the knowledge with regard to optical interference but also offers promise for applications in interferometry.
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篇名 Angular-spectrum-dependent interference
来源期刊 光:科学与应用(英文版) 学科
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年,卷(期) 2021,(11) 所属期刊栏目 Articles
研究方向 页码范围 2226-2232
页数 7页 分类号
字数 语种 英文
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光:科学与应用(英文版)
双月刊
2095-5545
22-1404/O4
吉林省长春市东南湖大路3888号
eng
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762
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