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Chin. Phys. B, 2026, Vol. 35(2): 024201    DOI: 10.1088/1674-1056/ae1c31
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Second-order correlated interference with multi-wavelength thermal-light beams

De-Sheng Wang(王德胜)1, Yi-Ning Zhao(赵一宁)1, Lingxin Kong(孔令鑫)1, Su-Heng Zhang(张素恒)2, Chong Wang(王翀)1, Cheng Ren(任承)1, Yuehua Su(苏跃华)1, and De-Zhong Cao(曹德忠)1,†
1 Department of Physics, Yantai University, Yantai 264005, China;
2 College of Physics Science & Technology, Hebei University, Baoding 071002, China
Abstract  A method for correlating thermal light over a wide spectral range is proposed. A multi-wavelength pseudothermal source, prepared by projecting laser beams of multiple wavelengths (650 nm, 635 nm, 532 nm, and 473 nm) onto a moving thin ground glass plate, is employed in a double-slit interference experiment. The ground glass plate induces random phase differences between light beams of different wavelengths passing through it. This initial random phase difference significantly influences the high-order intensity correlation functions of multi-wavelength thermal beams. Experimentally, second-order correlated interference patterns, including subwavelength interference, of pseudothermal beams with different wavelengths are observed in the intensity correlation measurements. This method facilitates applications of correlated thermal photons in quantum information processing and quantum imaging.
Keywords:  correlated interference      multi-wavelength thermal light      second-order correlation function  
Received:  17 September 2025      Revised:  04 November 2025      Accepted manuscript online:  06 November 2025
PACS:  42.25.Hz (Interference)  
  42.50.St (Nonclassical interferometry, subwavelength lithography)  
Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 62105278 and 11674273) and the Natural Science Foundation of Shandong Province (Grant No. ZR2023MA015).

Cite this article: 

De-Sheng Wang(王德胜), Yi-Ning Zhao(赵一宁), Lingxin Kong(孔令鑫), Su-Heng Zhang(张素恒), Chong Wang(王翀), Cheng Ren(任承), Yuehua Su(苏跃华), and De-Zhong Cao(曹德忠) Second-order correlated interference with multi-wavelength thermal-light beams 2026 Chin. Phys. B 35 024201

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