The Four-Quadrant Phase-Mask Coronagraph. II. Simulations

Details The Four-Quadrant Phase-Mask Coronagraph. II. Simulations The Four-Quadrant Phase-Mask Coronagraph. II. Simulations

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasp..113.1145r&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 113, Issue 787, pp. 1145-1154.

Physics

Optics

38

Instrumentation: Adaptive Optics, Methods: Numerical, Planetary Systems, Stars: Low-Mass, Brown Dwarfs

Scientific paper

In the first paper in this series, we described the principle of a coronagraph utilizing a four-quadrant phase mask and the results of numerical simulations obtained in the perfect case. In this second paper, we performed additional numerical simulations to assess in more detail the performances and limitations of this coronagraph under real conditions. The effect of geometrical parameters such as shape and size of both the phase mask and the Lyot stop is studied. We also analyze the effect of low- and high-order aberrations generated, for instance, by the atmospheric turbulence. An important issue is the wavelength dependence of the phase mask. We show that the performance decreases rapidly as the spectral bandwidth is increased, and as a consequence, we discuss the manufacturing of achromatized masks using multiple thin films. An optical concept is proposed.

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