Calcines Rosario, Ariadna and Dubbeldam, Cornelis M. and Sharples, Ray and Bourgenot, Cyril and Diaz, Ruben and Stephens, Andrew W. (2022) 'The HR image slicer for GNIRS at Gemini North: optical design and performance.', in Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; SPIE Astronomical Telescopes + Instrumentation. .
GNIRS (Gemini Near-InfraRed Spectrograph) is a multi-function spectrograph at Gemini North telescope offering four observational modes in the spectral range of 0.8 to 5.4 µm. It provides 2-pixel spectral resolutions from 1,200 up to 18,0000 and has single disperser and cross-disperser modes yielding simultaneous spectral bandwidths from 40 nm to 1,650 nm. GNIRS presented three existing modes: long-slit (50-100" slit), cross-dispersed (5-7" slit) and low resolution (LR) Integral Field Unit (IFU) (3.15" x 4.80") and it is now being upgraded with a fourth mode allowing high resolution (HR) IFU spectroscopy using an image slicer optimised for fully adaptively corrected images over a field of view of 2.25 arcsec2 (1.80" x 1.25") covered by 25 slices of 410 µm width offering a spatial sampling of 0.05 x 0.05 arscec2 with a diffraction limited optical quality. The proposed layout meets specifications and some challenging design constraints: it shall be contained within the same envelope defined by the LR image slicer (0.1 x 0.2 x 0.1 m3 ), the input and output focal-ratios of both image slicers shall be the same and at exact positions but providing different anamorphic magnifications and preserving the optical quality. The length of the generated slit will be similar to the length of the slit in long-slit mode to maximise detector use and avoid vignetting. This communication presents the optical design and performance of the high resolution image slicer compliant with all specifications and constraints and it shows some design adaptations adopted in order to facilitate its manufacturing in metal at Durham University.
|Item Type:||Book chapter|
|Full text:||(VoR) Version of Record|
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|Publisher Web site:||https://doi.org/10.1117/12.2626235|
|Publisher statement:||Copyright (2022) Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.|
|Date accepted:||No date available|
|Date deposited:||29 September 2022|
|Date of first online publication:||29 August 2022|
|Date first made open access:||29 September 2022|
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