Liger at Keck Observatory: image detector and IFS pick-off mirror assembly

Maren Cosens; Shelley A. Wright; Aaron Brown; Michael Fitzgerald; Chris Johnson; Tucker Jones; Marc Kassis; Evan Kress; Renate Kupke; James E. Larkin; Kenneth Magnone; Rosalie McGurk; Nils-Erik Rundquist; Ji Man Sohn; Eric Wang; James Wiley; Sherry Yeh

doi:10.1117/12.2630219

29 August 2022 Liger at Keck Observatory: image detector and IFS pick-off mirror assembly

Maren Cosens, Shelley A. Wright, Aaron Brown, Michael Fitzgerald, Chris Johnson, Tucker Jones, Marc Kassis, Evan Kress, Renate Kupke, James E. Larkin, Kenneth Magnone, Rosalie McGurk, Nils-Erik Rundquist, Ji Man Sohn, Eric Wang, James Wiley, Sherry Yeh

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121845Y (2022) https://doi.org/10.1117/12.2630219
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Liger is a next-generation near-infrared imager and integral field spectrograph (IFS) planned for the W.M. Keck Observatory. Liger is designed to take advantage of improved adaptive optics (AO) from the Keck All-Sky Precision Adaptive Optics (KAPA) upgrade currently underway. Liger operates at 0.84-2.45 µm with spectral resolving powers of R∼4,000-10,000. Liger makes use of a sequential imager and spectrograph design allowing for simultaneous observations. There are two spectrograph modes: a lenslet with high spatial sampling of 14 and 31 mas, and a slicer with 75 and 150 mas sampling with an expanded field of view. Two pick-off mirrors near the imager detector direct light to these two IFS channels. We present the design and structural analysis for the imager detector and IFS pick-off mirror mounting assembly that will be used to align and maintain stability throughout its operation. A piezoelectric actuator will be used to step through 3 mm of travel during alignment of the instrument to determine the optimal focus for both the detector and pick-off mirrors which will be locked in place during normal operation. We will demonstrate that the design can withstand the required gravitational and shipping loads and can be aligned within the positioning tolerances for the optics.

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Maren Cosens, Shelley A. Wright, Aaron Brown, Michael Fitzgerald, Chris Johnson, Tucker Jones, Marc Kassis, Evan Kress, Renate Kupke, James E. Larkin, Kenneth Magnone, Rosalie McGurk, Nils-Erik Rundquist, Ji Man Sohn, Eric Wang, James Wiley, and Sherry Yeh "Liger at Keck Observatory: image detector and IFS pick-off mirror assembly", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121845Y (29 August 2022); https://doi.org/10.1117/12.2630219

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