Near-infrared AO coronagraph design for giant telescopes

Brent L. Ellerbroek; Richard A. Buchroeder

doi:10.1117/12.459874

30 January 2003 Near-infrared AO coronagraph design for giant telescopes

Brent L. Ellerbroek, Richard A. Buchroeder

Proceedings Volume 4840, Future Giant Telescopes; (2003) https://doi.org/10.1117/12.459874
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

We describe the adaptive optical (AO) requirements, optical design, and expected performance of a near-infrared AO coronagraph for a 30 meter class giant telescope. The optical design of the instrument consists of back-to-back finite conjugate relays, each containing a collimated space between a pair of toric mirrors. The first collimated space contains the atmospheric dispersion compensator and the AO components, which are a tip/tilt mirror, a MEMS deformable mirror, and a beamsplitter for the wavefront sensing path. An occulting disk or similar focal plane mask is located at the intermediate image between the two relays, and a Lyot stop is placed at the pupil plane in the second relay. The required AO order of correction for a Strehl ratio of 0.9 at a wavelength of 2.2 microns is about 150 by 150, and the required control bandwidth is 42 Hz. The limiting magnitude at this level of performance is estimated to be 10.4.

Citation Download Citation

Brent L. Ellerbroek and Richard A. Buchroeder "Near-infrared AO coronagraph design for giant telescopes", Proc. SPIE 4840, Future Giant Telescopes, (30 January 2003); https://doi.org/10.1117/12.459874

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