Physics – Optics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7439e..10a&link_type=abstract
Astronomical and Space Optical Systems. Edited by Warren, Penny G.; Marshall, Cheryl J.; Tyson, Robert K.; Lloyd-Hart, Michael;
Physics
Optics
Scientific paper
NFIRAOS (Narrow Field InfraRed Adaptive Optics System, pronounced nefarious) is the first light adaptive optics system for the Thirty Meter Telescope (TMT). It is a near-IR, diffraction limited, multi-conjugate adaptive optics (MCAO) system that uses two deformable mirrors to correct aberrations due to atmospheric turbulence. The two arcminute field of view f/15 beam delivered by the telescope is relayed to one of three client instrument ports. Wavefront sensing is accomplished with six high order sodium laser guide star (LGS) wavefront sensors (WFSs) and three visible natural guide star (NGS) wavefront sensors. In this paper, we describe the general layout and design drivers of each optical system in NFIRAOS. The primary subsystems are the science path optics, the LGS wavefront sensors, the visible NGS truth WFSs, the IR acquisition camera and the calibration unit. Particular attention is given to the design of the LGS system, which uses all spherical components and a zoom system to compensate for aberrations and changes in distance to the sodium layer.
Atwood Jenny
Byrnes Peter
Herriot Glen
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