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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 6 — Mar. 25, 2013
  • pp: 7400–7410

Design and laboratory demonstration of an achromatic vector vortex coronagraph

Naoshi Murakami, Shoki Hamaguchi, Moritsugu Sakamoto, Ryohei Fukumoto, Akitoshi Ise, Kazuhiko Oka, Naoshi Baba, and Motohide Tamura  »View Author Affiliations


Optics Express, Vol. 21, Issue 6, pp. 7400-7410 (2013)
http://dx.doi.org/10.1364/OE.21.007400


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Abstract

A vector vortex coronagraph (VVC) is one of promising means for imaging extremely faint objects around bright stars such as exoplanets. We present a design of an achromatic VVC, in which an axially-symmetric half-wave plate (AHP) is placed between crossed polarization filters (circular polarizer and analyzer). The circular polarizer and the analyzer are both composed of a polarizer and a quarter-wave plate (QWP). We demonstrate, via Jones calculus and Fourier analysis, that the achromatic stellar elimination can theoretically be realized by optimal polarization filters, even when chromatic AHP and QWPs are used. We carried out laboratory demonstrations of the designed VVC using a photonic-crystal AHP. As a result, we observed achromatic coronagraphic performance, a light suppression level of 7 × 10−5, over a wavelength from 543 nm to 633 nm.

© 2012 OSA

OCIS Codes
(350.1260) Other areas of optics : Astronomical optics
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(050.4865) Diffraction and gratings : Optical vortices
(230.5298) Optical devices : Photonic crystals

ToC Category:
Diffraction and Gratings

History
Original Manuscript: September 11, 2012
Revised Manuscript: October 28, 2012
Manuscript Accepted: October 30, 2012
Published: March 18, 2013

Citation
Naoshi Murakami, Shoki Hamaguchi, Moritsugu Sakamoto, Ryohei Fukumoto, Akitoshi Ise, Kazuhiko Oka, Naoshi Baba, and Motohide Tamura, "Design and laboratory demonstration of an achromatic vector vortex coronagraph," Opt. Express 21, 7400-7410 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-6-7400


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