Experimental demonstration of binary shaped pupil mask coronagraphs for telescopes with obscured pupils
Kanae Haze, Keigo Enya, Lyu Abe, Aoi Takahashi, Takayuki Kotani,, Tomoyasu Yamamuro

TL;DR
This study demonstrates the fabrication and experimental testing of three binary shaped pupil mask coronagraphs suitable for telescopes with obscured pupils, achieving high contrast imaging without active wavefront control.
Contribution
The paper introduces three novel free-standing binary pupil masks designed for obscured telescopes, with experimental validation of their high-contrast performance in a vacuum chamber.
Findings
Mask-A achieved contrast of 10^{-4} to 10^{-7}
Mask-B achieved contrast of ~10^{-4}
Mask-C achieved contrast of 10^{-5} to 10^{-6}
Abstract
We present the fabrication and experimental demonstration of three free-standing binary shaped pupil mask coronagraphs, which are applicable for telescopes with partially obscured pupils. Three masks, designed to be complementary (labeled Mask-A, Mask-B, and Mask-C), were formed in 5 micron thick nickel. The design of Mask-A is based on a one-dimensional barcode mask. The design principle of Mask-B is similar, but has a smaller inner working angle and a lower contrast than Mask-A. Mask-C is based on a concentric ring mask and provides the widest dark region and a symmetric point spread function. Mask-A and Mask-C were both designed to produce a flexibly tailored dark region (i.e., non-uniform contrast). The contrast was evaluated using a light source comprising a broadband super-luminescent light-emitting diode with a center wavelength of 650 nm, and the measurements were carried out in…
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