Prototyping of a large-optic precision adjuster for NFIRAOS

Emma Rautio-Roe; Jeffrey Crane; Jenny Atwood; Olivier Lardière

doi:10.1117/12.3020709

26 August 2024 Prototyping of a large-optic precision adjuster for NFIRAOS

Emma Rautio-Roe, Jeffrey Crane, Jenny Atwood, Olivier Lardière

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131006M (2024) https://doi.org/10.1117/12.3020709
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

NFIRAOS (Narrow Field InfraRed Adaptive Optics System) is the first-light adaptive optics system designed for the Thirty Meter Telescope (TMT). NFIRAOS includes a laser guide star wavefront sensor system (NLGS) which contains a trombone mirror assembly that compensates for the altitude fluctuations of the sodium layer and the elevation angle of the telescope. Within the trombone mirror assembly, there are two heavy fold-mirrors whose housings contain precision adjusters to align the laser guide stars with the wavefront sensors.

The adjusters must achieve a resolution of 10 μrad and a range of 1 mrad to satisfy the NFIRAOS requirements for laser guide star stability on the wavefront sensors. The adjuster design has many unknowns so a prototype of these adjusters was developed and tested to determine the best design and material selection for use in NLGS. It was found that, although the resolution is unpredictable, the designed adjuster can meet the NFIRAOS requirements with feedback from the optical alignment system. It was also found that material selection and grease are very important to prevent seizing of the adjusters. The results from testing will be used to improve upon the current NLGS adjuster design.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Emma Rautio-Roe, Jeffrey Crane, Jenny Atwood, and Olivier Lardière "Prototyping of a large-optic precision adjuster for NFIRAOS", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131006M (26 August 2024); https://doi.org/10.1117/12.3020709

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