Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conquering the Rayleigh scattering limit of silica glass fiber at
  visible wavelengths with a hollow-core fiber approach   The ultimate limit on fiber loss is set by the intrinsic Rayleigh scattering
of silica glass material. Here, we challenge this limit in the visible region
by using a hollow-core fiber approach. Two visible-guiding hollow-core
conjoined-tube negative-curvature fibers are successfully fabricated and
exhibit the overall losses of 3.8 dB/km at 680 nm and 4.9 dB/km at 558 nm
respectively. The loss of the latter fiber surpasses the Rayleigh scattering
limit of silica glass fiber in the green spectral region by 2 dB. Numerical
simulation indicates that this loss level is still much higher than the
fundamental surface scattering loss limit of hollow-core fiber.

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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg