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- W4297581946 abstract "The atmospheric characterization of habitable candidates is one of the effective approaches for search for life out of the solar system. However, it is much hard by high planet-star flux contrast, 10<sup>-8 </sup>- 10<sup>-10</sup> . A coronagraphic mask proposed by Itoh & Matsuo (2020) can suppress host stellar light but is imposed by a strict wavelength range limit of 0.3%. A spectroscopic coronagraph that combines the diffraction-limited coronagraph with a spectrograph is expected to achieve enlarges the effective bandwidth. On the other hand, a non-common path error, which is induced by the spectrograph, could limit the achievable contrast. We designed a high-accuracy spectrograph motivated for the spectroscopic coronagraph and measured its wavefront error. The common path error is 9.9 nm RMS, which is mostly caused by the alignment error between the convex grating and spherical mirror of the spectrograph. The achievable contrast of the spectroscopic coronagraph was also estimated from the non-common path error measurement. We found that the contrast of 10<sup>-8 </sup>could be achieved with a bandwidth of 5%, which is a promising result as the first step." @default.
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- W4297581946 date "2022-08-29" @default.
- W4297581946 modified "2023-09-26" @default.
- W4297581946 title "Development of a high-precision spectrograph for diffraction-limited coronagraphs" @default.
- W4297581946 doi "https://doi.org/10.1117/12.2629324" @default.
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