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12 July 2018 The HARMONI/ELT spectrographs
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Abstract
HARMONI is an Integral Field Spectrograph (IFS) for ESO’s ELT. It has been selected as the first light spec- trograph and will provide the workhorse spectroscopic capabilities for the ELT for many years. HARMONI is currently at the PDR-level and the current design for the HARMONI IFS consists of a number of spaxel scales sampling down to the diffraction limit of the telescope. It uses a field splitter and image slicer to divide the field into 4 sub-units, each providing an input slit to one of four nearly identical spectrographs. All spectrographs will operate at near infrared wavelengths (0.81-2.45 micrometers), sampling different parts of the spectrum with a range of spectral resolving powers (3300, 7000, 18000). In addition, two of the four spectrographs will have a Visible capability (0.5-0.83 micrometers) operating with seeing-limited observations. This proceeding presents an overview of the opto-mechanical design and specifications of the spectrograph units for HARMONI.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Rodrigues, J. Capone, A. Earle, T. Foster, A. Hidalgo, I. Lewis, J. Lynn, K. O'brien, I. Tosh, E. M. George, M. Accardo, D. Alvarez, R. Conzelmann, J. Hopgood, F. Clarke, H. Schnetler, M. Tecza, and N. Thatte "The HARMONI/ELT spectrographs", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107029M (12 July 2018); doi: 10.1117/12.2313396; https://doi.org/10.1117/12.2313396
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