Compact Spatial Heterodyne Spectrometer Using a Fully Nanostructured Grating Based Architecture

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This paper introduces a compact spatial heterodyne spectrometer architecture based on a three-grating nanostructured design. By replacing bulky Michelson interferometers with a purely diffractive, mechanically stable configuration, the system reduces optical complexity and improves system integrability. This approach enables robust, high-performance spectral measurement suitable for small, cost-effective space observation missions.