= Physical origin of the Gouy phase shift by Simin Feng and Herbert G. Winful
{tag=Work by Simin Feng}
{tag=Work by Herbert G. Winful}
{title2=2001}
{title2=10.1364/OL.26.000485}
https://opg.optica.org/ol/abstract.cfm?uri=OL-26-8-485
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: https://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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