Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large Binocular Telescope Adaptive Optics System: New achievements and
  perspectives in adaptive optics   The Large Binocular Telescope (LBT) is a unique telescope featuring two
co-mounted optical trains with 8.4m primary mirrors. The telescope Adaptive
Optics (AO) system uses two innovative key components, namely an adaptive
secondary mirror with 672 actuators and a high-order pyramid wave-front sensor.
During the on-sky commissioning such a system reached performances never
achieved before on large ground-based optical telescopes. Images with 40mas
resolution and Strehl Ratios higher than 80% have been acquired in H band (1.6
micron). Such images showed a contrast as high as 10e-4. Based on these
results, we compare the performances offered by a Natural Guide Star (NGS)
system upgraded with the state-of-the-art technology and those delivered by
existing Laser Guide Star (LGS) systems. The comparison, in terms of sky
coverage and performances, suggests rethinking the current role ascribed to NGS
and LGS in the next generation of AO systems for the 8-10 meter class
telescopes and Extremely Large Telescopes (ELTs).

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The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th