Angular-spectrum-dependent interference  

作　　者：Chen Yang Zhi-Yuan Zhou Yan Li Shi-Kai Liu Zheng Ge Guang-Can Guo Bao-Sen Shi 

机构地区：[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

出　　处：《Light(Science & Applications)》2021年第11期2226-2232,共7页光（科学与应用)（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(NSFC)(61605194,11934013,61525504);the Anhui Initiative In Quantum Information Technologies(AHY020200);the China Postdoctoral Science Foundation(2017M622003,2018M642517).

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.

关 键 词：INTERFEROMETER SPECTRUM INTERFEROMETRY 

分 类 号：O43[机械工程—光学工程]