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Optics Letters

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  • Vol. 27, Iss. 5 — Mar. 1, 2002
  • pp: 345–347

High-resolution phase imaging of phase singularities in the focal region of a lens

J. N. Walford, K. A. Nugent, A. Roberts, and R. E. Scholten  »View Author Affiliations


Optics Letters, Vol. 27, Issue 5, pp. 345-347 (2002)
http://dx.doi.org/10.1364/OL.27.000345


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Abstract

Subwavelength-resolution phase images of phase dislocations at the focal region of a 20× , 0.4-N.A. lens have been obtained by use of an optical fiber interferometer with a tapered probe in one arm. A phase-stepping algorithm is used to determine a quantitative value of the phase at each point in the scan, clearly showing the presence of edge dislocations between the Airy rings of the diffraction pattern near the lens focus, as well as four isolated screw-type singularties caused by astigmatism in the lens.

© 2002 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(060.2350) Fiber optics and optical communications : Fiber optics imaging
(110.0180) Imaging systems : Microscopy
(110.2350) Imaging systems : Fiber optics imaging
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(180.3170) Microscopy : Interference microscopy

Citation
J. N. Walford, K. A. Nugent, A. Roberts, and R. E. Scholten, "High-resolution phase imaging of phase singularities in the focal region of a lens," Opt. Lett. 27, 345-347 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-5-345


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