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Proceedings Paper

MIRAO: a mid-IR adaptive optics system design for TMT
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Paper Abstract

We present a design of a thermal-infrared optimized adaptive optics system for the TMT 30-meter telescope. The approach makes use of an adaptive secondary but during an initial implementation contains a more conventional ambient-temperature optical relay and deformable mirror. The conventional optical relay is used without sacrificing the thermal background by using multiple off-axis laser guide stars to avoid a warm dichroic in the common path. Three laser guide stars, equally spaced 75" off axis, and a "conventional" 30×30 deformable mirror provide a Strehl > 0.9 at wavelengths longer than 10 microns and the LGS beams can be passed to the LGS wavefront sensors with pickoff mirrors while a one-arcminute field is passed unvignetted to the science instrument and NGS WFSs. The overall design is relatively simple with a wavefront correction similar to existing high-order systems (e.g. 30×30) but still provides competitive performance over the higher-order TMT NIR AO design at wavelengths as short as 3 microns due to its reduced thermal emissivity. We present our figures of merit and design considerations within the context of the science drivers for high-spectral resolution NIR/MIR spectroscopy at 5-28 microns on a 30-meter ground-based telescope.

Paper Details

Date Published: 27 June 2006
PDF: 10 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62720S (27 June 2006); doi: 10.1117/12.670062
Show Author Affiliations
Mark R. Chun, Institute for Astronomy, Univ. of Hawaii, Hilo (United States)
Jay Elias, National Optical Astronomy Observatory (United States)
Brent Ellerbroek, Celtco/TMT (United States)
Tim Bond, Institute for Astronomy, Univ. of Hawaii, Hilo (United States)
Ming Liang, National Optical Astronomy Observatory (United States)
Richard Clare, Celtco/TMT (United States)
Alan Tokunaga, Institute for Astronomy, Univ. of Hawaii, Hilo (United States)
Matt Richter, Univ. of California, Davis (United States)
Larry Daggert, National Optical Astronomy Observatory (United States)

Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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