Binary-star Wave Front Control Based on a Common-path Visible Nulling Coronagraph

Abstract Exoplanets around multiple-star systems are interesting targets for direct detection. However, it is difficult to suppress unwanted light from all stars in a system. For detection of the exoplanets systems, we propose using common-path visible nulling coronagraphs (CP-VNCs). CP-VNCs can diffracted located on central null fringe. In addition, wave front control system installed generate dark hole by rejecting residual stellar speckles CP-VNCs. this purpose, spatial modulators (SLMs) have ability over wide field order hundreds λ / D (where wavelength and telescope diameter), owing their large number pixels. We perform laboratory demonstration high-contrast observation binary-star model CP-VNC combined with an SLM. First, simulate region close one two generating square side lengths 40 0 sources). The center was about 35 79 each star. Measurements first scenario find mean contrast 3.5 × 10 −8 . Second, identical separation (100 ) both also demonstrated. scenario, 2.0 achieved circular diameter