
1.CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, China
2.Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui, China
Zhi-Yuan Zhou (zyzhouphy@ustc.edu.cn)
Bao-Sen Shi (drshi@ustc.edu.cn)
Published:30 November 2021,
Published Online:26 October 2021,
Received:29 March 2021,
Revised:30 September 2021,
Accepted:11 October 2021
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Yang, C. et al. Angular-spectrum-dependent interference. Light: Science & Applications, 10, 2226-2232 (2021).
Yang, C. et al. Angular-spectrum-dependent interference. Light: Science & Applications, 10, 2226-2232 (2021). DOI: 10.1038/s41377-021-00661-z.
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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