Applications of optical-vortices require a dark core. Darkness is limited by the bandwidth of the light-source, and the degree of spatial-and-temporal-coherence. The on-axis intensity of a spatially-symmetric beam is reported here for a broadband light-source.
© 2005 Optical Society of America
G. A. Swartzlander, Jr., "Broadband Brightness of the Vortex Core," in Frontiers in Optics, OSA Technical Digest Series (Optical Society of America, 2005), paper JWA24.
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