Speckle Symmetry with High-Contrast Coronagraphs

Details Speckle Symmetry with High-Contrast Coronagraphs Speckle Symmetry with High-Contrast Coronagraphs

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasp..114..132b&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 114, Issue 792, pp. 132-136.

Physics

Optics

19

Instrumentation: Adaptive Optics, Instrumentation: High Angular Resolution, Techniques: Image Processing

Scientific paper

We investigate the pattern of residual speckles obtained with high-contrast coronagraphs and extreme adaptive optics systems. In particular, we provide evidence of symmetry occurring for very small phase defects depending only on the ability of the coronagraph to attenuate the pupil diffraction pattern. In such a case, a centrosymmetrical subtraction of the image significantly increases the signal-to-noise ratio. Detection of very faint companions around bright stars may benefit from this characteristic in some particular conditions. Numerical simulations show that speckle symmetry takes place when using a four-quadrant phase mask coronagraph, for very high Strehl ratio (SR>0.96) and with a filled circular aperture.

Affiliated with

Also associated with

No associations

Rating

Speckle Symmetry with High-Contrast Coronagraphs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Speckle Symmetry with High-Contrast Coronagraphs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speckle Symmetry with High-Contrast Coronagraphs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1042746