Field sampling adaptive optics: a new concept for multi-IFU spectrographs

Details Field sampling adaptive optics: a new concept for multi-IFU spectrographs Field sampling adaptive optics: a new concept for multi-IFU spectrographs

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7015e..58c&link_type=abstract

Adaptive Optics Systems. Edited by Hubin, Norbert; Max, Claire E.; Wizinowich, Peter L. Proceedings of the SPIE, Volume 7015

Physics

Optics

Scientific paper

Multi-IFU spectrographs such as KMOS can observe considerably deeper if their fields are adaptively corrected. MOAO and segmented-MCAO are two techniques that have been proposed to adaptively correct large fields on future ELTs. Field Sampling Adaptive Optics (FSAO) provides a series of significant advantages over both these methods. FSAO is similar in application to MOAO where each IFU field has its own Deformable Mirror (DM). FSAO independently steers the pupil images of a few IFU fields onto a single DM, which would work in combination with a ground-layer conjugated DM on the telescope. Wavefront reference sources from LGSs and NGSs are used in open-loop in a similar manner to MOAO. Each FSAO DM corrects for more than one IFU field (as with segmented MCAO) but the corrected subfields of each DM can be positioned anywhere in the telescope field instead of being fixed, a critical advantage when all objects are concentrated in a small field. Another significant advantage of FSAO is that the conjugate altitude of the FSAO DM can easily be modified by adjusting pupil overlap. The advantages of FSAO and the critical method of superimposition of the different pupil images on the DM in terms of image quality, distortion, position and rotation will be discussed as well as how the advantages increase with the primary diameter from 5-m to 42-m telescopes.

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