Low Speckle Noise Coronagraph with UNI+PAC

Details Low Speckle Noise Coronagraph with UNI+PAC Low Speckle Noise Coronagraph with UNI+PAC

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confq..42k&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

Physics

Optics

Scientific paper

Unbalanced nulling interferometer (UNI) and phase and amplitude correction (PAC) by an adaptive optics system with two deformable mirrors is a novel pre-optics of a coronagraph which can absorb the dynamic range (the central star intensity and the speckle intensity) of about 1E-2. UNI makes a wavefront error magnification and after that the error can be virtually compensated beyond the AO limit, e.g., getting lambda/10000 quality wavefront by lambda/1000 optics. A space coronagraph which has a dynamic range of 1E-8 with lambda/1000 quality combined with the UNI-PAC can achieve total dynamic range of 1E-10 with lambda/1000 wavefront quality throughout the optics. In an experiment, we confirmed the error magnification by the UNI (lambda/80 -> lambda/20, under the central star reduction ratio is 5%) and we are now trying to compensate the magnified wavefront errors and observe the reduced speckle intensity with a common-path AIC nulling coronagraph.

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