Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extreme Adaptive Optics in the mid-IR: The METIS AO system   Adaptive Optics at mid-IR wavelengths has long been seen as either not
necessary or easy. The impact of atmospheric turbulence on the performance of
8-10 meter class telescopes in the mid-IR is relatively small compared to other
performance issues like sky background and telescope emission. Using a
relatively low order AO system, Strehl Ratios of larger than 95% have been
reported on 6-8 meter class telescopes. Going to 30-42 meter class telescopes
changes this picture dramatically. High Strehl Ratios require what is currently
considered a high-order AO system. Furthermore, even with a moderate AO system,
first order simulations show that the performance of such a system drops
significantly when not taking into account refractivity effects and atmospheric
composition variations. Reaching Strehl Ratios of over 90% at L, M and N band
will require special considerations and will impact the system design and
control scheme of AO systems for mid-IR on ELTs. In this paper we present an
overview of the effects that impact the performance of an AO system at mid-IR
wavelengths on an ELT and simulations on the performance and we will present a
first order system concept of such an AO system for METIS, the mid-IR
instrument for the E-ELT.

18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th