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Title:
OSIRIS: a diffraction limited integral field spectrograph for Keck
Authors:
Larkin, James; Barczys, Matthew; Krabbe, Alfred; Adkins, Sean; Aliado, Ted; Amico, Paola; Brims, George; Campbell, Randy; Canfield, John; Gasaway, Thomas; Honey, Allan; Iserlohe, Christof; Johnson, Chris; Kress, Evan; LaFreniere, David; Lyke, James; Magnone, Ken; Magnone, Nick; McElwain, Michael; Moon, Juleen; Quirrenbach, Andreas; Skulason, Gunnar; Song, Inseok; Spencer, Michael; Weiss, Jason; Wright, Shelley
Affiliation:
AA(Univ. of California, Los Angeles (USA)), AB(Univ. of California, Los Angeles (USA)), AC(Univ. Köln (Germany)), AD(California Association for Research in Astronomy (USA)), AE(Univ. of California, Los Angeles (USA)), AF(California Association for Research in Astronomy (USA)), AG(Univ. of California, Los Angeles (USA)), AH(California Association for Research in Astronomy (USA)), AI(Univ. of California, Los Angeles (USA)), AJ(Space Sciences Lab, Univ. of California, San Diego (USA)), AK(California Association for Research in Astronomy (USA)), AL(Univ. Köln (Germany)), AM(Univ. of California, Los Angeles (USA)), AN(Univ. of California, Los Angeles (USA)), AO(Univ. de Montréal (Canada)), AP(California Association for Research in Astronomy (USA)), AQ(Univ. of California, Los Angeles (USA)), AR(Univ. of California, Los Angeles (USA)), AS(Univ. of California, Los Angeles (USA)), AT(Univ. of California, Los Angeles (USA)), AU(Sterrewacht Leiden (Netherlands)), AV(Univ. of California, Los Angeles (USA)), AW(Gemini Observatory (USA)), AX(Univ. of California, Los Angeles (USA)), AY(Univ. of California, Los Angeles (USA)), AZ(Univ. of California, Los Angeles (USA))
Publication:
Ground-based and Airborne Instrumentation for Astronomy. Edited by McLean, Ian S.; Iye, Masanori. Proceedings of the SPIE, Volume 6269, pp. 62691A (2006). (SPIE Homepage)
Publication Date:
07/2006
Origin:
SPIE
DOI:
10.1117/12.672061
Bibliographic Code:
2006SPIE.6269E..42L

Abstract

We present an overview of the OSIRIS integral field spectrograph which was recently commissioned on the Keck II Telescope. OSIRIS works with the Keck Adaptive Optics system and utilizes an infrared transmissive lenslet array to sample a rectangular field of view at close to the Keck diffraction limit. By packing the spectra close together (2 pixel rows per spectrum) and using the Rockwell Hawaii-2 detector (wavelengths between 1 and 2.5 microns), we achieve a relatively large field of view (up to 6."4) while maintaining full broad-band spectral coverage at a resolution of 3800. Among the challenges of the instrument are: a fully cryogenic design (approximately 250 kg are brought down to 55K); four spatial scales from 0."02 to 0."10 extremely low wavefront error (approximately 25 nm of non-common path error); large all aluminum optics for the spectrograph; extremely repeatable spectral formats; and a sophisticated data reduction pipeline. OSIRIS also serves as a starting point for our design of IRIS which is a planned integral field spectrograph for the Thirty Meter Telescope.
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