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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 30 — Oct. 20, 2007
  • pp: 7485–7493

Requirements on optical density and phase dispersion of imperfect band-limited occulting masks in a broadband coronagraph

Erkin Sidick  »View Author Affiliations


Applied Optics, Vol. 46, Issue 30, pp. 7485-7493 (2007)
http://dx.doi.org/10.1364/AO.46.007485


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Abstract

We investigate the effects of the parasitic phase of imperfect band-limited occulting masks on the broadband contrast performance of a high-contrast imaging system through modeling and simulations. We also examine the effects of the phase and the optical-density dispersions of occulting masks whose parasitic phase has been compensated at the center wavelength but is nonzero at other wavelengths. Two types of occulting masks are considered: gray-scale masks such as those made on a high-energy beam-sensitive glass, and recently proposed spatially profiled metal masks, both having 1D Sinc 2 ( linear - Sinc 2 ) amplitude transmission coefficient ( Sinc 4 intensity transmittance) profiles. We determine the conditions for obtaining 1 × 10 9 and 1 × 10 10 contrast values with a light centered at a 785   nm wavelength and having a 10% bandwidth in a coronagraphic telescope having ideal optical surfaces but imperfect band-limited image-plane occulting masks.

© 2007 Optical Society of America

OCIS Codes
(110.6770) Imaging systems : Telescopes
(220.4830) Optical design and fabrication : Systems design

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: May 22, 2007
Revised Manuscript: August 22, 2007
Manuscript Accepted: August 24, 2007
Published: October 12, 2007

Citation
Erkin Sidick, "Requirements on optical density and phase dispersion of imperfect band-limited occulting masks in a broadband coronagraph," Appl. Opt. 46, 7485-7493 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-30-7485


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References

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  8. K. Balasubramanian, is preparing a manuscript to be called "Band-limited image masks for TPF coronagraph--materials and designs for broadband performance."
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  12. J. J. Green and S. B. Shaklan, "Optimizing coronagraph designs to minimize their contrast sensitivity to low-order optical aberrations," in Techniques and Instrument for Detection of Exoplanets, D. R. Coulter, ed., Proc. SPIE 5170, 25-37 (2003). [CrossRef]
  13. E. Sidick, A. C. Kuhnert, and J. T. Trauger, "Broadband performance of TPF's high-contrast imaging testbed: modeling and simulations," in Advanced Wavefront Control: Methods, Devices, and Applications IV, M. K. Giles, J. D. Gonglewski, and R. A. Carreras, eds., Proc. SPIE 6306, 63060U (2006).
  14. D. Moody, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (personal communications, 2007).

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