Sliced-pupil grating: a novel concept for increasing spectral resolution (original) (raw)

22nd Congress of the International Commission for Optics: Light for the Development of the World, 2011

Abstract

ABSTRACT This paper presents the opto-mechanical design of a novel spectroscopic element - sliced pupil grating - that allows increasing the spectral resolution while keeping the instrument geometry. The concept is based on "cutting" the pupil into different slices by placing a number of prisms at the two sites of a VPH grating. The independent beams are guided through a precise opto-mechanical assembly to assure the recombination of the individual images on the detector within the available error budget, producing a single spectrum. To probe the feasibility of the concept, we have designed and manufactured a 3-slice prototype for an already-built spectrograph (Elmer, for the GTC 10-m telescope).

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