VPHGs for FORS-UP at VLT

Michele Frangiamore; Andrea Bianco; Alessio Zanutta; Frédéric Derie; Antonio Manescau Hernandez; Johan Kosmalski

doi:10.1117/12.2629365

29 August 2022 VPHGs for FORS-UP at VLT

Michele Frangiamore, Andrea Bianco, Alessio Zanutta, Frédéric Derie, Antonio Manescau Hernandez, Johan Kosmalski

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 1218852 (2022) https://doi.org/10.1117/12.2629365
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The FORS Upgrade project (FORS-Up) aims at bringing a new life to FORS (the visual and near UV FOcal Reducer and low dispersion Spectrograph for the VLT). One of the activity focuses on the installation of three new GRISMs. One at low-resolution covering the 0.33 to 0.62 um spectral range (centered at) and two at higher resolution targeting the Sodium and Potassium signals, which are centered at 0.58 um and 0.77 um respectively. The three VPHGs have been designed by means of an RCWA (rigorous coupled-wave analysis) approach and the feasibility of using the innovative photopolymers developed by COVESTRO AG has been evaluated. Thanks to the new high performances of the mentioned photosensitive materials, it has been possible to ensure a high peak efficiency together with a large efficiency over the bandwidth. In parallel, the GRISM parameters have been set and the overall efficiency of the dispersing element has been evaluated.

Citation Download Citation

Michele Frangiamore, Andrea Bianco, Alessio Zanutta, Frédéric Derie, Antonio Manescau Hernandez, and Johan Kosmalski "VPHGs for FORS-UP at VLT", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 1218852 (29 August 2022); https://doi.org/10.1117/12.2629365

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