Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Full Nonlinear Conversion of Broadband Frequency Combs generated by
  Four-Wave Mixing in Highly Nonlinear Fibers   We generate a 200-nm optical frequency comb at 1.5 microns by injecting two
single-frequency lasers into a highly nonlinear fiber, and explore its spectral
phase properties and high power to demonstrate full nonlinear conversion into
its second harmonic. Combs of optical frequencies with 100-nm (~ 48 THz)
bandwidths, centered at 790-800 nm and spaced by 0.8-1 nm (380-470 GHz) were
produced by second harmonic and multiple sum frequency generation simply by
focusing into a 2-mm long nonlinear crystal. Conventional birefringence phase
matching was used in normal incidence configuration without tilting the
crystal.

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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin