22 July 2016 Opto-mechanical design of an image slicer for the GRIS spectrograph at GREGOR
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Abstract
An image slicer has been proposed for the Integral Field Spectrograph [1] of the 4-m European Solar Telescope (EST) [2] The image slicer for EST is called MuSICa (Multi-Slit Image slicer based on collimator-Camera) [3] and it is a telecentric system with diffraction limited optical quality offering the possibility to obtain high resolution Integral Field Solar Spectroscopy or Spectro-polarimetry by coupling a polarimeter after the generated slit (or slits). Considering the technical complexity of the proposed Integral Field Unit (IFU), a prototype has been designed for the GRIS spectrograph at GREGOR telescope at Teide Observatory (Tenerife), composed by the optical elements of the image slicer itself, a scanning system (to cover a larger field of view with sequential adjacent measurements) and an appropriate re-imaging system. All these subsystems are placed in a bench, specially designed to facilitate their alignment, integration and verification, and their easy installation in front of the spectrograph. This communication describes the opto-mechanical solution adopted to upgrade GRIS while ensuring repeatability between the observational modes, IFU and long-slit. Results from several tests which have been performed to validate the opto-mechanical prototypes are also presented.
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N. Vega Reyes, M. A. Esteves, J. Sánchez-Capuchino, Y. Salaun, R. L. López, F. Gracia, P. Estrada Herrera, C. Grivel, J. J. Vaz Cedillo, M. Collados, "Opto-mechanical design of an image slicer for the GRIS spectrograph at GREGOR", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99125P (22 July 2016); doi: 10.1117/12.2232615; https://doi.org/10.1117/12.2232615
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