Conference item
ELT HARMONI: image slicer preliminary design
- Abstract:
- Harmoni is the ELT's first light visible and near-infrared integral field spectrograph. It will provide four different spatial scales, ranging from coarse spaxels of 60 × 30 mas best suited for seeing limited observations, to 4 mas spaxels that Nyquist sample the diffraction limited point spread function of the ELT at near-infrared wavelengths. Each spaxel scale may be combined with eleven spectral settings, that provide a range of spectral resolving powers from R 3500 to R 20000 and instantaneous wavelength coverage spanning the 0.47 - 2.45 μm wavelength range of the instrument. The consortium consists of several institutes in Europe under leadership of Oxford University. Harmoni is starting its Final Design Phase after a Preliminary Design Phase in November, 2017. The CRAL has the responsibility of the Integral Field Unit design linking the Preoptics to the 4 Spectrographs. It is composed of a field splitter associated with a relay system and an image slicer that create from a rectangular Field of View a very long (540mm) output slit for each spectrograph. In this paper, the preliminary design and performances of Harmoni Image Slicer will be presented including image quality, pupil distortion and slit geometry. It has been designed by CRAL for Harmoni PDR in November, 2017. Special emphases will be put on straylight analysis and slice diffraction. The optimisation of the manufacturing and slit geometry will also be reported.
- Publication status:
- Published
- Peer review status:
- Reviewed (other)
Actions
Access Document
- Files:
-
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(Preview, Accepted manuscript, pdf, 1.2MB, Terms of use)
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- Publisher copy:
- 10.1117/12.2312497
Authors
- Publisher:
- Society of Photo-Optical Instrumentation Engineers
- Host title:
- Proceedings of SPIE: Ground-based and Airborne Instrumentation for Astronomy VII
- Journal:
- Ground-based and Airborne Instrumentation for Astronomy VII More from this journal
- Volume:
- 10702
- Publication date:
- 2018-07-12
- Acceptance date:
- 2018-07-12
- Event location:
- Austin, Texas, United States
- DOI:
- EISSN:
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1996-756X
- ISSN:
-
0277-786X
- ISBN:
- 9781510619579
- Keywords:
- Pubs id:
-
pubs:891641
- UUID:
-
uuid:6e7028d8-e59b-4f8d-aa42-6bdf4c629b0e
- Local pid:
-
pubs:891641
- Source identifiers:
-
891641
- Deposit date:
-
2019-01-14
Terms of use
- Copyright holder:
- Society of Photo-Optical Instrumentation Engineers
- Copyright date:
- 2018
- Notes:
- © (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). This is a conference paper presented at SPIE Astronomical Telescopes + Instrumentation, 10-15 June 2018, Austin, Texas, United States. This is the accepted manuscript version of the article. The final version is available online from Society of Photo-Optical Instrumentation Engineers at: https://doi.org/10.1117/12.2312497
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