A vortex spatial filter

David Palacios; Grover A. Swartzlander

Conference on Lasers and Electro-Optics
OSA Technical Digest (Optica Publishing Group, 2001),
paper CWN6

A vortex spatial filter

David Palacios and Grover A. Swartzlander

Conference on Lasers and Electro-Optics 2001

Baltimore, Maryland United States
6–10 May 2001
ISBN: 1-55752-662-1

From the session
Optical Diagnostics and Novel Effects (CWN)

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D. Palacios and G. A. Swartzlander, "A vortex spatial filter," in Conference on Lasers and Electro-Optics, J. Kafka, K. Vahala, R. Williamson, and A. Willner, eds., OSA Technical Digest (Optica Publishing Group, 2001), paper CWN6.

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Abstract

An optical vortex is a black hole in a beam of light owing to destructive interference. This dark core gives us a method for opening an arbitrarily dark window in a bright coherent beam allowing scattered light from off axis sources to be seen. One of the possible applications of a vortex spatial filter is the detection of a faint astronomical object near a star.² The bright coherent on axis source will be darkened by the vortex allowing the diffracted light from a nearby object to be detected.

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