Compact three mirror anastigmat space telescope design using 6.5m monolithic primary mirror

Daewook Kim; Heejoo Choi; Ewan Douglas

doi:10.1117/12.2682180

4 October 2023 Compact three mirror anastigmat space telescope design using 6.5m monolithic primary mirror

Daewook Kim, Heejoo Choi, Ewan Douglas

Proceedings Volume 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV; 126770E (2023) https://doi.org/10.1117/12.2682180
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

The utilization of a 6.5m monolithic primary mirror in a compact three-mirror anastigmat (TMA) telescope design offers unprecedented capabilities to accommodate various next generation science instruments. This design enables the rapid and efficient development of a large aperture telescope without segmented mirrors while maintaining a compact overall form factor. With its exceptional photon collection area and diffraction-limited resolving power, the TMA design is ideally suited for both the ground and space active/adaptive optics concepts, which require the capture of natural guide stars within the field of view for wavefront measurement to correct for misalignments and shape deformation caused by thermal gradients. The wide field of view requirement is based on statistical analysis of bright natural guide stars available during observation. The primary mirror clear aperture, compactness requirement, and detector pixel sizes led to the choice of TMA over simpler two-mirror solutions like Ritchey-Chretien (RC) telescopes, and the TMA design offers superior diffraction-limited performance across the entire field of view. The standard conic surfaces applied to all three mirrors (M1, M2, and M3) simplify the optical fabrication, testing, and alignment process. Additionally, the TMA design is more tolerant than RC telescopes. Stray light control is critical for UV science instrumentation, and the field stop and Lyot stop are conveniently located in the TMA design for this purpose.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Daewook Kim, Heejoo Choi, and Ewan Douglas "Compact three mirror anastigmat space telescope design using 6.5m monolithic primary mirror", Proc. SPIE 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV, 126770E (4 October 2023); https://doi.org/10.1117/12.2682180

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