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

Chun, Mark R. and Elias, Jay and Ellerbroek, Brent and Bond, Tim and Liang, Ming and Clare, Richard and Tokunaga, Alan and Richter, Matt and Daggert, Larry (2006) MIRAO: a mid-IR adaptive optics system design for TMT. In: Advances in Adaptive Optics II. Proceedings of SPIE. No.6272. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 62720S. ISBN 9780819463371.

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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.

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Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the Association of Universities for Research in Astronomy (AURA), the California Institute of Technology and the University of California. This work was supported, as well, by the Canada Foundation for Innovation, the Gordon and Betty Moore Foundation, the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation, the Ontario Ministry of Research and Innovation, and the National Research Council of Canada.
Group:Thirty Meter Telescope
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
University of CaliforniaUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
National Optical Astronomy Observatory (NOAO)UNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Subject Keywords:adaptive optics, mid IR, thermal emissivity, laser guide stars, large telescopes
Series Name:Proceedings of SPIE
Issue or Number:6272
Record Number:CaltechAUTHORS:20190520-154707395
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Official 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); doi: 10.1117/12.670062;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95621
Deposited By: Tony Diaz
Deposited On:20 May 2019 22:55
Last Modified:16 Nov 2021 17:14

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