25 August 2010 The optical design of a highly segmented, very wide-field spectrograph
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Abstract
In this paper we work out the optical design of, basically, a limited Field of View off-axis camera. This element is the ingredient of a much more complex very wide field of view spectrograph and it is intended to avoid technological difficulties related with huge optics by replicating such element (or family of such elements). The optical design has to deal with the large off-axis aberration at a point in the Field of View as far from the optical axis as about 0.75 degree. This requires special tools for treating the convergence of the optical design as, for instance, vignetting on the edges can be severe because of the strong aberrations at the field lens entrance. Constraints into the optical design are particularly interesting as well: in fact the overall cross section of the design have to lie within the footprint of the entrance Field of View in order to allow for an array of such a design to be assembled together and guarantee the space for the allocation of micro-mechanisms required for movable slits and grisms in each module.
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Demetrio Magrin, Demetrio Magrin, Roberto Ragazzoni, Roberto Ragazzoni, Andrea Baruffolo, Andrea Baruffolo, Marco Dima, Marco Dima, Giorgia Gentile, Giorgia Gentile, Jacopo Farinato, Jacopo Farinato, Valentina Viotto, Valentina Viotto, Andrea Bianco, Andrea Bianco, Andrea DiPaola, Andrea DiPaola, Fernando Pedichini, Fernando Pedichini, Roberto Speziali, Roberto Speziali, Dario Maccagni, Dario Maccagni, Adriano Fontana, Adriano Fontana, } "The optical design of a highly segmented, very wide-field spectrograph", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77354I (25 August 2010); doi: 10.1117/12.857115; https://doi.org/10.1117/12.857115
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