Mechanical design and integration of the Gemini High-Resolution Optical Spectrograph (GHOST) lens barrels assemblies.

John Pazder; Andre Anthony; Alan McConnachie; Greg Burley

doi:10.1117/12.2630620

29 August 2022 Mechanical design and integration of the Gemini High-Resolution Optical Spectrograph (GHOST) lens barrels assemblies.

John Pazder, Andre Anthony, Alan McConnachie, Greg Burley

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 1218453 (2022) https://doi.org/10.1117/12.2630620
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

GHOST instrument is being developed for the Gemini telescope and is a collaboration between AAO, the Herzberg Astronomy and Astrophysics (HAA) in Canada and the Australian National University (ANU). The instrument is a fiber fed spectrograph with R<50,000 in two-object mode and R<75,000 in single object mode. This paper presents mechanical design and optical alignment of the lens barrels used for the two cameras in the instrument. A divide and conquer approach was used. Camera lenses were aligned to their respective individual cells for the tilt and axial spacing, and then bonded to flexures for stability. Centering of the lens to each other was done as the individual cells were stacked into barrels. Alignment in tilt and axial position was performed on Laser Alignment and Assembly Station (LAS) manufactured by Opto-Alignment Technology, Inc. Design of the individual optical cells provides low-stress restraint and at the same time ensures high rigidity and long-term mechanical stability of the mount.

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John Pazder, Andre Anthony, Alan McConnachie, and Greg Burley "Mechanical design and integration of the Gemini High-Resolution Optical Spectrograph (GHOST) lens barrels assemblies.", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 1218453 (29 August 2022); https://doi.org/10.1117/12.2630620

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