To achieve very-high spectral resolution (R>100 000) with large telescopes (D>8 m) new solutions have been investigated, like anamorphic pupil slicing, elliptical pupils, slanted VPH gratings, starting from the initial design of CODEX, as proposed by B. Delabre.
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Spanò, P., Dekker, H. (2009). New Design Approach for a Very-High Resolution Spectrograph for the VLT Combined Focus. In: Moorwood, A. (eds) Science with the VLT in the ELT Era. Astrophysics and Space Science Proceedings. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9190-2_70
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DOI: https://doi.org/10.1007/978-1-4020-9190-2_70
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