Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Adaptive Optics for Extremely Large Telescopes   Adaptive Optics has become a key technology for the largest ground-based
telescopes currently under or close to begin of construction. Adaptive optics
is an indispensable component and has basically only one task, that is to
operate the telescope at its maximum angular resolution, without optical
degradations resulting from atmospheric seeing. Based on three decades of
experience using adaptive optics usually as an add-on component, all extremely
large telescopes and their instrumentation are designed for diffraction limited
observations from the very beginning. This review illuminates the various
approaches of the Extremely Large Telescope, the Giant Magellan Telescope, and
the Thirty-Meter Telescope, to fully integrate adaptive optics in their
designs. The article concludes with a brief look into the requirements that
high-contrast imaging poses on adaptive optics.

27
The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
20
The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex