Physical origin of the Gouy phase shift by Simin Feng and Herbert G. Winful 2026-11-05
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Primary theoretical research, Optics Letters 26(8), pp. 485–487, 15 April 2001, DOI 10.1364/OL.26.000485. Full published bylines verified on p. 485. University-hosted primary PDF: sites.unimi.it/aqm/wp-content/uploads/Feng-2001.pdf . Equations 4–12 connect transverse confinement to axial phase and give the Gaussian arctangent result; the discussion distinguishes one- and two-dimensional focusing.
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