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23 August 2016 Upgrade of the detector in the integral field spectrograph OSIRIS at the W. M. Keck Observatory
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We present the results of the upgrade of the spectrograph detector in the integral field spectrograph, OSIRIS. OSIRIS is a near-infrared (1 to 2.5 microns) integral field spectrograph on the Keck I telescope. This instrument produces up to 3,000 spectra simultaneously over a contiguous rectangular field of view with a spectral resolution of ~3,800. OSIRIS works with the Keck Adaptive Optics system to achieve diffraction-limited spatial resolution and has four plate scales ranging from 0.02 to 0.10 arcseconds. At first light in 2005, the spectrograph portion of the instrument was equipped with a Rockwell Hawaii-2 detector. We have now upgraded this to a Teledyne Hawaii-2RG (H2RG) with lower read noise, lower dark current, and higher quantum efficiency. In addition to the upgraded detector, we also mounted the detector head on a linear stage, allowing the position of the detector to be accurately adjusted along the optical path when the instrument is at cryogenic temperatures (~80 K). This reduced the number of cool downs required to put the detector image plane at the spectrograph camera focus and adjust any residual tip/tilt of the detector image plane. We present the results of commissioning the new detector and the improved sensitivities of the OSIRIS instrument due to this upgrade.
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Anna Boehle, James E. Larkin, Sean M. Adkins, Theodore Aliado, Michael P. Fitzgerald, Christopher A. Johnson, James E. Lyke, Kenneth G. Magnone, Ji Man Sohn, Eric Wang, and Jason L. Weiss "Upgrade of the detector in the integral field spectrograph OSIRIS at the W. M. Keck Observatory", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99082Q (23 August 2016);

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