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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 7 — Apr. 4, 2005
  • pp: 2394–2402

10-7 contrast ratio at 4.5λ/D: New results obtained in laboratory experiments using nano-fabricated coronagraph and multi-Gaussian shaped pupil masks

Abhijit Chakraborty, Laird A. Thompson, and Michael Rogosky  »View Author Affiliations


Optics Express, Vol. 13, Issue 7, pp. 2394-2402 (2005)
http://dx.doi.org/10.1364/OPEX.13.002394


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Abstract

We present here new experimental results on high contrast imaging of 10-7 at 4.5λ/D (λ=0.820 microns) by combining a circular focal plane mask (coronagraph) of 2.5λ/D diameter and a multi-Gaussian pupil plane mask. Both the masks were fabricated on very high surface quality (λ/30) BK7 optical substrates using nano-fabrication techniques of photolithography and metal lift-off. This process ensured that the shaped masks have a useable edge roughness better than λ/4 (rms error better than 0.2 microns), a specification that is necessary to realize the predicted theoretical limits of any mask design. Though a theoretical model predicts a contrast level of 10-12, the background noise of the observed images was speckle dominated which reduced the contrast level to 4×10-7 at 4.5λ/D. The optical setup was built on the University of Illinois Seeing Improvement System (UnISIS) optics table which is at the Coude focus of the 2.5-m telescope of the Mt. Wilson Observatory. We used a 0.820 micron laser source coupled with a 5 micron single-mode fiber to simulate an artificial star on the optical test bench of UnISIS.

© 2005 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(050.1220) Diffraction and gratings : Apertures

ToC Category:
Research Papers

History
Original Manuscript: January 27, 2005
Revised Manuscript: February 24, 2005
Published: April 4, 2005

Citation
Abhijit Chakraborty, Laird Thompson, and Michael Rogosky, "10-7 contrast ratio at 4.5λ/D: New results obtained in laboratory experiments using nano-fabricated coronagraph and multi-Gaussian shaped pupil masks," Opt. Express 13, 2394-2402 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-7-2394


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References

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