Herbert G. Winful is an electrical-engineering researcher at the University of Michigan whose work includes nonlinear optics and photonics. His institutional record and the full byline of his 2001 paper with Simin Feng verify this identity.[ref]
Herbert Winful profile at the University of Michigan. Official faculty research-interest record
[ref]Physical origin of the Gouy phase shift by Simin Feng and Herbert G. Winful. Printed p.485, full bylines and affiliation
Their primary analysis relates the Gouy phase of a focused wave to transverse confinement and the distribution of transverse wave vectors. It accounts for the different phase contributions in line and point focusing, rather than relying on a geometrical explanation restricted to one focusing geometry.[ref]
Physical origin of the Gouy phase shift by Simin Feng and Herbert G. Winful. Equations4–12 and the one- versus two-transverse-dimension discussion, pp.485–486
A constructed interference example shows why a phase contribution is measurable even when the separate beam powers are unchanged. Let two mutually coherent beams each contribute light intensity at a detector. If their fields have relative phase , their combined intensity isA relative phase change from zero to changes the combined intensity from to zero at that location. Each beam alone still contributes . This is an ideal local interference calculation, not a reported experimental result from the theoretical paper; spatial overlap and polarization must also permit interference.
Gouy phase interferometry uses this phase sensitivity while separating the focusing contribution from ordinary optical-path changes and wavefront curvature. The scientific distinction is between a measured intensity pattern and the phase information inferred using a specified field model. The paper's relevance to optical cavities likewise comes from phase matching, rather than from beam width alone.
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