
Proceedings Paper
Optical and mechanical design of the fore-optics of HARMONIFormat | Member Price | Non-Member Price |
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Paper Abstract
HARMONI is a visible and near-infrared (0.47μm to 2.5μm) integral field spectrometer providing the E-ELT's core
spectroscopic capability. It will provide ~32000 simultaneous spectra of a rectangular field of view at four foreseen
different spatial sample (spaxel) scales. The HARMONI fore-optics re-formats the native telescope plate scale to suitable
values for the downstream instrument optics. This telecentric adaptation includes anamorphic magnification of the plate
scale to optimize the performance of the IFU, which contains the image slicer, and their four spectrographs. In addition,
it provides an image of the telescope pupil to assemble a cold stop shared among all the scales allowing efficient
suppression of the thermal background. A pupil imaging unit also re-images the pupil cold stop onto the image slicer to
check the relative alignment between the E-ELT and HARMONI pupils. The scale changer will also host the filter wheel
with the long-pass filters to select the wavelength range. The main reasoning specifying the importance of the
HARMONI fore-optics and its current optical and mechanical design is described in this contribution.
Paper Details
Date Published: 28 July 2014
PDF: 13 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91479J (28 July 2014); doi: 10.1117/12.2055504
Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)
PDF: 13 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91479J (28 July 2014); doi: 10.1117/12.2055504
Show Author Affiliations
J. Sánchez-Capuchino, Instituto de Astrofísica de Canarias (Spain)
E. Hernández, Instituto de Astrofísica de Canarias (Spain)
A. Bueno, Instituto de Astrofísica de Canarias (Spain)
J. M. Herreros, Instituto de Astrofísica de Canarias (Spain)
E. Hernández, Instituto de Astrofísica de Canarias (Spain)
A. Bueno, Instituto de Astrofísica de Canarias (Spain)
J. M. Herreros, Instituto de Astrofísica de Canarias (Spain)
Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)
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