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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 26, Iss. 8 — Apr. 15, 2001
  • pp: 497–499

Peering into darkness with a vortex spatial filter

Grover A. Swartzlander, Jr.  »View Author Affiliations


Optics Letters, Vol. 26, Issue 8, pp. 497-499 (2001)
http://dx.doi.org/10.1364/OL.26.000497


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Abstract

I propose to use as a window the dark core of an optical vortex to examine a weak background signal hidden in the glare of a bright coherent source. Applications such as the detection of an astronomical object, forward-scattered radiation, and incoherent light are described whereby signal enhancements of at least 7 orders of magnitude may be achieved.

© 2001 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(100.5090) Image processing : Phase-only filters
(120.1880) Instrumentation, measurement, and metrology : Detection
(290.0290) Scattering : Scattering
(350.1260) Other areas of optics : Astronomical optics

Citation
Grover A. Swartzlander, Jr., "Peering into darkness with a vortex spatial filter," Opt. Lett. 26, 497-499 (2001)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-26-8-497


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References

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  13. Calculations were made with a DEC Alpha workstation and a fast-Fourier transform algorithm on a 512×512 numerical grid.
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  16. The intensity of the planetary signal across a small aperture (Rap/Rdiff< < 1) is relatively constant, and thus the transmitted power varies as (Rap)2. However, relation 2 predicts that the transmitted power for the stellar vortex will increase as (Rap)8.72 for m=4. Thus we find that when the relative aperture size Rap/Rdiff is decreased from 0.19 to 0.1, the optimum enhancement factor, Pp/Ps, increases by a factor of (1.9)6.72. In this case we estimate that Pp/Ps≈2×107.

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