5 June 2018 Spectrographs with holographic gratings on freeform surfaces: design approach and application for the LUVOIR mission
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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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Eduard R. Muslimov, Eduard R. Muslimov, Marc Ferrari, Marc Ferrari, Emmanuel Hugot, Emmanuel Hugot, Jean-Claude R. Bouret, Jean-Claude R. Bouret, Coralie Neiner, Coralie Neiner, Simona Lombardo, Simona Lombardo, Gerard Lemaitre, Gerard Lemaitre, Robert Grange, Robert Grange, } "Spectrographs with holographic gratings on freeform surfaces: design approach and application for the LUVOIR mission ", Proc. SPIE 10690, Optical Design and Engineering VII, 106901H (5 June 2018); doi: 10.1117/12.2311887; https://doi.org/10.1117/12.2311887
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