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

Mark R. Chun; Jay Elias; Brent Ellerbroek; Tim Bond; Ming Liang; Richard Clare; Alan Tokunaga; Matt Richter; Larry Daggert

doi:10.1117/12.670062

27 June 2006 MIRAO: a mid-IR adaptive optics system design for TMT

Mark R. Chun, Jay Elias, Brent Ellerbroek, Tim Bond, Ming Liang, Richard Clare, Alan Tokunaga, Matt Richter, Larry Daggert

Author Affiliations +

Proceedings Volume 6272, Advances in Adaptive Optics II; 62720S (2006) https://doi.org/10.1117/12.670062
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

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.

Citation Download Citation

Mark R. Chun, Jay Elias, Brent Ellerbroek, Tim Bond, Ming Liang, Richard Clare, Alan Tokunaga, Matt Richter, and Larry Daggert "MIRAO: a mid-IR adaptive optics system design for TMT", Proc. SPIE 6272, Advances in Adaptive Optics II, 62720S (27 June 2006); https://doi.org/10.1117/12.670062

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