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Speckle noise in highly corrected coronagraphs

Show simple item record Bloemhof, Eric E. 2007-02-23T18:38:26Z 2007-02-23T18:38:26Z 2004-08-02
dc.identifier.citation SPIE 49th International Symposium on Optical Science and Technology Annual Meeting, Denver, Colorado, August 2-6, 2004. en
dc.identifier.clearanceno 04-2444
dc.description.abstract Speckles in a highly corrected adaptive optic imaging system have been studied through numerical simulations and through analytic and aigebraic investigations of the Fourier-optical expressions connecting pupil plane and focal plane, which simplify at high Strehl ratio. Significant insights into the behavior of speckles, and the speckle noise caused when they vary over time, have thus been gained. Such speckle noise is expected to set key limits on the sensitivity of searches for companions around other stars, including extrasolar planets. In most cases, it is advantageous to use a coronagraph of some kind to suppress the bright primary star and so enhance the dynamic range of companion searches. In the current paper, I investigate speckle behavior and its impact on speckle noise in some common coronagraphic architectures, including the classical Lyot coronagraph and the new four quadrant phase mask (FQPM) concept. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 2167317 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004. en
dc.subject adaptive optics en
dc.subject speckles en
dc.subject atmospheric turbulence en
dc.title Speckle noise in highly corrected coronagraphs en
dc.type Preprint en

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