Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zenith-Distance Dependence of Chromatic Shear Effect: A Limiting Factor
  for an Extreme Adaptive Optics System   Consider a perfect AO system with a very fine wavefront sampling interval and
a very small actuator interval. If this AO system senses wavefront at a
wavelength, lambda_{WFS}, and does science imaging at another wavelength,
lambda_{SCI}, the light paths through the turbulent atmosphere at these two
wavelengths are slightly different for a finite zenith distance, z. The error
in wavefront reconstruction of the science channel associated with this
non-common path effect, or so-called chromatic shear, is uncorrectable and sets
an upper bound of the system performance. We evaluate the wavefront variance,
sigma^2(lambda_{WFS},lambda_{SCI},z) for a typical seeing condition at Mauna
Kea and find that this effect is not negligible at a large z. If we require
that the Strehl ratio be greater than 99 or 95%, z must be less than about 50
or 60 deg respectively, for the combination of visible wavefront sensing and
infrared science imaging.

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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an