Spectrographs with holographic gratings on freeform surfaces: design approach and application for the LUVOIR mission

Abstract : In the present paper we demonstrate the approach to use a holographic grating on a freeform surface for advanced spectrographs design. On the example POLLUX spectropolarimeter medium-UV channel we chow that such a grating can operate as a cross-disperser and a camera mirror at the same time. It provides the image quality high enough to reach the spectral resolving power of 126 359-133 106 between 11.5 and 195 nm, which is higher than the requirement. Also we show a possibility to use a similar element working in transmission to build an unobscured double-Schmidt spectrograph. The spectral resolving power reaches 2750 for a long slit. It is also shown that the parameters of both the gratings are feasible with the current technologies.
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https://hal.archives-ouvertes.fr/hal-02349478
Contributor : Coralie Neiner <>
Submitted on : Tuesday, November 5, 2019 - 4:41:40 PM
Last modification on : Wednesday, November 13, 2019 - 3:40:09 PM

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Eduard R. Muslimov, Marc Ferrari, Emmanuel Hugot, Jean-Claude Bouret, Coralie Neiner, et al.. Spectrographs with holographic gratings on freeform surfaces: design approach and application for the LUVOIR mission. Optical Design and Engineering VII, May 2018, Frankfurt, Germany. pp.45, ⟨10.1117/12.2311887⟩. ⟨hal-02349478⟩

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