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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 8205–8213

Improving vector vortex waveplates for high-contrast coronagraphy

Sarik R. Nersisyan, Nelson V. Tabiryan, Dimitri Mawet, and Eugene Serabyn  »View Author Affiliations


Optics Express, Vol. 21, Issue 7, pp. 8205-8213 (2013)
http://dx.doi.org/10.1364/OE.21.008205


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Abstract

Vector vortex waveplates (VVWs) open the door to new techniques in stellar coronagraphy and optical communications, but the performance of currently available liquid-crystal-polymer-based VVWs tends to be limited by defects in the axial region of the vortex pattern. As described here, several steps allow for a reduction in the size of such axial defects, including the use of photoalignment materials with high photosensitivity and reversible response, and a reduction in exposure energy. Moreover, redistributing the writing beam’s intensity from the axial region to its periphery (using a VVW) allows the production of large area VVWs with a small defect area. Finally, using VVWs as linear to axial polarization converters allows producing VVWs of higher topological charge, while also reducing the photoalignment time to a few minutes. These steps have allowed the fabrication of VVWs with topological charges of 1 and 2 with central defect sizes below 3 μm.

© 2013 OSA

OCIS Codes
(160.3710) Materials : Liquid crystals
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Diffraction and Gratings

History
Original Manuscript: February 7, 2013
Revised Manuscript: March 21, 2013
Manuscript Accepted: March 21, 2013
Published: March 28, 2013

Citation
Sarik R. Nersisyan, Nelson V. Tabiryan, Dimitri Mawet, and Eugene Serabyn, "Improving vector vortex waveplates for high-contrast coronagraphy," Opt. Express 21, 8205-8213 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-7-8205


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References

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