Multi-color experiments for a binary-shaped pupil mask coronagraph

Physics

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Scientific paper

We present results of our laboratory experiment with a binary-shaped pupil mask coronagraph for the direct observation of exoplanets. A binary-shaped pupil mask coronagraph is planned to be installed in Next-generation infrared space telescope SPICA. We are now carring out experiments to demonstrate a principle that the pupil mask coronagraph works on all wavelength bands. Broadband and multiband light sources with 650, 750, 800 and 850nm were used for our experiments. As a results, we verified that the coronagraph produces significant improvement in contrast at the wavelengths. We also present the coronagraph experiment with the PSF subtraction using a He-Ne laser. Additionally, we undertake development of the low-temperature vacuum chamber for the laboratory coronagraph experiment with mid-infrared range.

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