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| Paper: |
Two-Stage Coronagraph for High Contrast Imaging |
| Monograph: |
11, HWO25 Proceedings Part II: Mission Framework, Technology, and Broader Contributions |
| Page: |
205 |
| Authors: |
Jun Nishikawa, Naoshi Murakami, Kenta Yoneta, Yosuke Tanaka, and
Keigo Enya |
| DOI: |
10.26624/QWYP2566 |
| Abstract: |
High contrast imaging is an essential technique for direct observation of terrestrial exoplanets in HWO.
Various types of coronagraphs have been demonstrated so far, but a contrast of 1e-10 is still a challenging goal.
One of the solutions is the two-stage coronagraph.
The first Lyot mask coronagraph will block most of the star light as early as possible before it encounters many optical elements,
thus suppressing the overall generation of incoherent scattered light.
The partial attenuation of light by the first coronagraph improves the phase resolution of the downstream deformable mirror in effect,
thereby enabling deep dark hole digging. |
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