Liger at Keck Observatory: design of imager optical assembly and spectrograph re-imaging optics

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

doi:10.1117/12.2630611

29 August 2022 Liger at Keck Observatory: design of imager optical assembly and spectrograph re-imaging optics

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

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 1218464 (2022) https://doi.org/10.1117/12.2630611
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Liger is an adaptive optics (AO) fed imager and integral field spectrograph (IFS) designed to take advantage of the Keck All-sky Precision Adaptive-optics (KAPA) upgrade for the W.M. Keck Observatory. We present the design and analysis of the imager optical assembly including the spectrograph Re-Imaging Optics (RIO) which transfers the beam path from the imager focal plane to the IFS slicer module and lenslet array. Each imager component and the first two RIO mechanisms are assembled and individually aligned on the same optical plate. Baffling suppresses background radiation and scattered light, and a pupil viewing camera allows the imager detector to focus on an image of the telescope pupil. The optical plate mounts on an adapter frame for alignment of the overall system. The imager and RIO will be characterized in a cryogenic test chamber before installation in the final science cryostat.

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James Wiley, Aaron Brown, Renate Kupke, Maren Cosens, Shelley A. Wright, Michael Fitzgerald, Chris Johnson, Tucker Jones, Marc Kassis, Evan Kress, James E. Larkin, Kenneth Magnone, Rosalie McGurk, Nils Rundquist, Eric Wang, and Sherry Yeh "Liger at Keck Observatory: design of imager optical assembly and spectrograph re-imaging optics", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 1218464 (29 August 2022); https://doi.org/10.1117/12.2630611

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