The SOAR integral field unit spectrograph optical design and IFU implementation

A. C. de Oliveira; L. S. de Oliveira; C. D. Gneiding; B. Barbuy; D. Jones; M. V. Figueredo; J. R. D. Lépine; V. B. P. Macanhan; J. B. Carvalho de Oliveira; K. Taylor

doi:10.1117/12.857698

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20 July 2010 The SOAR integral field unit spectrograph optical design and IFU implementation

A. C. de Oliveira, L. S. de Oliveira, C. D. Gneiding, B. Barbuy, D. Jones, M. V. Figueredo, J. R. D. Lépine, V. B. P. Macanhan, J. B. Carvalho de Oliveira, K. Taylor

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Proceedings Volume 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation; 77394S (2010) https://doi.org/10.1117/12.857698
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

SIFS is a lenslet/fiber Integral Field Unit Spectrograph which has just been delivered to the SOAR 4.1m telescope in Chile. The instrument was designed and constructed by the National Laboratory of Astrophysics (MCT/LNA) in collaboration with the Department of Astronomy of the Institute of Astronomy, Geophysics and Atmospheric Sciences of the University of Sao Paulo (IAG/USP). It is designed to operate at both the raw Nasmyth and the SAM (the SOAR Adaptive Optics Module) which delivers GLAO-corrected images in optical wave-bands longward of 500nm. The lenslets have a 1mm pitch feeding a set of 1,300 fibres in a 26-by-50 format. Sets of deployable fore-optics convert the f/16.5 input beam to give samplings between ~0.1 and 0.3 arcsec. The fiber output is in the form of a curved, pupil-centric, long-slit which is fed into a bench-mounted spectrograph. An off-axis Maksutov collimates the beam onto a set of VPH gratings and thence imaged by an f/3 refractive camera onto a 2-by-1 mosaic of 2k-by-4k E2V CCDs. The camera is articulated over a >90 deg. angle to allow the grating/camera combination to operate in a transmission Littrow configuration. The wavelength range is limited by the CCDs to the 350 to 1000nm range with spectral resolution maxima of ~20,000. The paper will review the optical design of the spectrograph and the methods used to fabricate the lenslet/fiber IFU.

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A. C. de Oliveira, L. S. de Oliveira, C. D. Gneiding, B. Barbuy, D. Jones, M. V. Figueredo, J. R. D. Lépine, V. B. P. Macanhan, J. B. Carvalho de Oliveira, and K. Taylor "The SOAR integral field unit spectrograph optical design and IFU implementation", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77394S (20 July 2010); https://doi.org/10.1117/12.857698

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