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| Paper: |
Development of Broadband Coronagraphic Phase Masks and Wavefront Control Technique |
| Monograph: |
11, HWO25 Proceedings Part II: Mission Framework, Technology, and Broader Contributions |
| Page: |
201 |
| Authors: |
Naoshi Murakami, Kenta Yoneta, Jun Nishikawa, Yosuke Tanaka, Shunya Sato, Hajime Kawahara, Keigo Enya, Takayuki Kotani, Aoi Takahashi, Shota Miyazaki, and Toru Yamada |
| DOI: |
10.26624/CPLZ3568 |
| Abstract: |
The focal-plane phase-mask coronagraph is one of the attractive solutions for the HWO toward exploration of habitable exoplanets.
We are developing segmented phase masks based on multilayer photonic-crystal waveplates for broadband high-contrast observations.
It is expected that the segmented phase masks exhibit high throughput for off-axis planetary signal along “high-throughput axes” (boundaries between segments).
Several prototype fabrications have been conducted so far with various designs (e.g., eight-octant and twelve-sector phase masks with fourth- and sixth-order stellar suppression capabilities), central wavelengths, and target contrasts.
Several prototype fabrications have been conducted so far, and we evaluated the fabricated masks at a laboratory coronagraph simulator and a spectroscopic ellipsometer.
In addition, we are also developing an optical module to enhance the broadband capability of the wavefront control for dark hole digging.
The early prototype of the proposed optical module has been constructed in the laboratory for proof of concept.
We expect that these broadband high-contrast techniques will be beneficial for not only spectroscopic characterization of exoplanets to search for biosignatures, but also multiband photometry of exoplanets for retrieving planetary surface mapping. |
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