New design approaches for a very high resolution spectrograph for the combined focus of the VLT

Paolo Spanò; Bernard Delabre; Hans Dekker; Gerardo Avila

doi:10.1117/12.789283

9 July 2008 New design approaches for a very high resolution spectrograph for the combined focus of the VLT

Paolo Spanò, Bernard Delabre, Hans Dekker, Gerardo Avila

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 70140M (2008) https://doi.org/10.1117/12.789283
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

To achieve very-high spectral resolutions (R>100,000) with large telescopes (D>8m) new optical solutions have been investigated in the context of the ESPRESSO project for the VLT, starting from the initial design of CODEX for the E-ELT. ESPRESSO is a high-efficiency, high-stability, high-resolution visible spectrograph for the combined Coude focus of the VLT. Among these new solutions, we can mention: free-form optics, used to design an all-mirror anamorphic pupil slicer, large mosaic echelle grating, slanted VPH gratings, super-corrected atmospheric dispersion corrector. All these solutions have been usefully applied to design the spectrograph for ESPRESSO, and its Coude relay system.

Citation Download Citation

Paolo Spanò, Bernard Delabre, Hans Dekker, and Gerardo Avila "New design approaches for a very high resolution spectrograph for the combined focus of the VLT", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70140M (9 July 2008); https://doi.org/10.1117/12.789283

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