Design for stray-light reduction to a Martian ionospheric imager

Hiromu Nakagawa, Atsushi Yamazaki, Keigo Enya, Naofumi Fujishiro, Naoki Terada, Kanako Seki

Research output: Contribution to journalArticlepeer-review


We demonstrate a new design high-contrast optics suitable for use on a stray-light reduction. Two-dimensional distribution of diffracted light was numerically analyzed and confirmed by a laboratory measurement to determine its characteristics. Laboratory measurements confirm stray-light performance with ∼10−8 rejection viewing as close as 1.0 to a bright-light source. The present improvement replaces the conventional normal-edge vane by an edge with microscopic Gaussian-shaped structures. This permits simplified fabrication, provides even more weight reduction, and delivers improved performance for a given size.

Original languageEnglish
Pages (from-to)9937-9943
Number of pages7
JournalApplied Optics
Issue number32
Publication statusPublished - 2020 Nov 10


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