Speckle noise in highly corrected coronagraphs

Eric E. Bloemhof

doi:10.1117/12.560370

12 October 2004 Speckle noise in highly corrected coronagraphs

Eric E. Bloemhof

Proceedings Volume 5553, Advanced Wavefront Control: Methods, Devices, and Applications II; (2004) https://doi.org/10.1117/12.560370
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Speckles in a highly corrected adaptive optic imaging system have been studied through numerical simulations and through analytic and algebraic 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 planets1. 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.

Citation Download Citation

Eric E. Bloemhof "Speckle noise in highly corrected coronagraphs", Proc. SPIE 5553, Advanced Wavefront Control: Methods, Devices, and Applications II, (12 October 2004); https://doi.org/10.1117/12.560370

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