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Correlation processing of optical amplitude fluctuations is made by means of optical heterodyne detection processes. The first-order correlation and power spectrum of the amplitude fluctuations are obtainable by use of three laser beams.
A. Ono
"Optical heterodyne detection processes for obtaining first-order correlation and power spectrum of optical amplitude fluctuations", Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27782W (1 September 1996); https://doi.org/10.1117/12.2298986
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A. Ono, "Optical heterodyne detection processes for obtaining first-order correlation and power spectrum of optical amplitude fluctuations," Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27782W (1 September 1996); https://doi.org/10.1117/12.2298986