LXIV. New contributions to interferometry. Part I.—New non-localized interference fringes

Abstract

New non-localized interference fringes, produced with a small source and a Fabry-Perot interferometer, are described. These extend into space in the form of cones, producing sharp rings when allowed to fall upon a screen. The properties of these rings are examined. A striking characteristic is that without lenses sharp rings of great diameter can be produced (diameter of first ring equal to half a metre). Complex patterns are produced with various slit sources. Possible applications of the new fringes are considered.