28 June 2006 OSIRIS: a diffraction limited integral field spectrograph for Keck
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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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James Larkin, James Larkin, Matthew Barczys, Matthew Barczys, Alfred Krabbe, Alfred Krabbe, Sean Adkins, Sean Adkins, Ted Aliado, Ted Aliado, Paola Amico, Paola Amico, George Brims, George Brims, Randy Campbell, Randy Campbell, John Canfield, John Canfield, Thomas Gasaway, Thomas Gasaway, Allan Honey, Allan Honey, Christof Iserlohe, Christof Iserlohe, Christopher A. Johnson, Christopher A. Johnson, Evan Kress, Evan Kress, David LaFreniere, David LaFreniere, James Lyke, James Lyke, Ken Magnone, Ken Magnone, Nick Magnone, Nick Magnone, Michael McElwain, Michael McElwain, Juleen Moon, Juleen Moon, Andreas Quirrenbach, Andreas Quirrenbach, Gunnar Skulason, Gunnar Skulason, Inseok Song, Inseok Song, Michael Spencer, Michael Spencer, Jason Weiss, Jason Weiss, Shelley Wright, Shelley Wright, } "OSIRIS: a diffraction limited integral field spectrograph for Keck", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62691A (28 June 2006); doi: 10.1117/12.672061; https://doi.org/10.1117/12.672061

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