A coronagraph system with unbalanced nulling interferometer: progress of wavefront correction

Details A coronagraph system with unbalanced nulling interferometer: progress of wavefront correction A coronagraph system with unbalanced nulling interferometer: progress of wavefront correction

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7731e.151n&link_type=abstract

Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave. Edited by Oschmann, Jacobus M., Jr.; Clampin

Physics

Optics

Scientific paper

We have proposed a four-stage coronagraph system with an unbalanced nulling interferometer (UNI). It consists of a first adaptive optics (AO), the UNI, a second AO, and a coronagraph. An important feature is a magnification of the wavefront aberrations in the UNI stage, which enables us to compensate for the wavefront aberrations beyond the AO systems capabilities. In our experiments, we have observed the aberration magnification of about 6 times and compensated to about lambda/100 rms corresponding to lambda/600 rms virtually, and its performance is becoming stable. We have put a 3-dimensional Sagnac interferometric nulling coronagraph at the final stage of the system and tried to see the speckle reduction with the UNI-PAC system.

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