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Study of Coronagraphic Techniques

Published online by Cambridge University Press:  02 May 2006

Volker Tolls ,
Michael Aziz ,
Robert A. Gonsalves ,
Sylvain Korzennik ,
Antoine Labeyrie ,
Richard Lyon ,
Gary Melnick ,
Steve Somerstein ,
Gopal Vasudevan  and
Robert Woodruff
Volker Tolls
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA email: vtolls@cfa.harvard.edu
Michael Aziz
Affiliation:
Harvard University, Cambridge, MA 02138, USA
Robert A. Gonsalves
Affiliation:
Tufts University, 161 College Ave., Medford, MA 02155
Sylvain Korzennik
Affiliation:
Harvard University, Cambridge, MA 02138, USA
Antoine Labeyrie
Affiliation:
Observatoire de Haute-Provence, 04870 Saint-Michel l'Observatoire, France
Richard Lyon
Affiliation:
NASA/Goddard Space Flight Center, Code 935, Greenbelt, MD 20771
Gary Melnick
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA email: vtolls@cfa.harvard.edu
Steve Somerstein
Affiliation:
Lockheed-Martin Corporation, 3251 Hanover Street, Palo Alto, CA94304
Gopal Vasudevan
Affiliation:
Lockheed-Martin Corporation, 3251 Hanover Street, Palo Alto, CA94304
Robert Woodruff
Affiliation:
Lockheed-Martin Corporation, P.O. Box 179, Denver, CO 80201
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Abstract

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SAO has set up a testbed to study coronagraphic techniques, starting with Labeyrie's multi-step speckle reduction technique. This technique expands the general concept of a coronagraph by incorporating a speckle corrector (phase and/or amplitude) in combination with a second occulter for speckle light suppression. The correction function is derived applying the phase diversity method on images taken in focus and slightly out-of-focus. The occulter masks for the testbed will initially be produced lithographically. However, in a parallel program we are studying a new manufacturing method. This method utilizes focussed ion beams and will directly mill the mask shape into absorbing material deposited on a transparent substrate.

Keywords

instrumentation: adaptive opticsinstrumentation: miscellaneousmethods: laboratorytechniques: miscellaneous(stars:) planetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C200: Direct Imaging of Exoplanets: Science & Techniques , October 2005 , pp. 457 - 460
Copyright
© 2006 International Astronomical Union