10 July 2018 New over-octave VPHG architecture for DOLORES spectrograph at TNG
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Specific astronomical science cases could take advantage of VPHG devices with design and features tailored for achieving the best performances. The manufacturing process require materials where it is possible to precisely control the efficiency response, specially in complex optical designs, where the realization tolerances have to be strictly fulfilled. In this paper, we present an innovative design for the DOLORES spectrograph @ TNG as an example of complex VPHG (in GRISM mode) based on photopolymers. This dispersing element and its prisms were designed to cover, with low R, more than one octave and to disentangle 1st and 2nd diffraction orders avoiding the typical contamination. The ok-sky results are finally presented.
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Alessio Zanutta, Alessio Zanutta, Paola Galli, Paola Galli, Vania Lorenzi, Vania Lorenzi, Emilio Molinari, Emilio Molinari, Marco Landoni, Marco Landoni, Chiara Righi, Chiara Righi, Andrea Bianco, Andrea Bianco, "New over-octave VPHG architecture for DOLORES spectrograph at TNG", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107064W (10 July 2018); doi: 10.1117/12.2311322; https://doi.org/10.1117/12.2311322

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