Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mapping the nonlinear optical susceptibility by noncollinear second
  harmonic generation   We present a method, based on noncollinear second harmonic generation, to
evaluate the non-zero elements of the nonlinear optical susceptibility. At a
fixed incidence angle, the generated signal is investigated by varying the
polarization state of both fundamental beams. The resulting polarization charts
allows to verify if Kleinman symmetry rules can be applied to a given material
or to retrieve the absolute value of the nonlinear optical tensor terms, from a
reference measurement. Experimental measurements obtained from Gallium Nitride
layers are reported. The proposed method does not require an angular scan thus
is useful when the generated signal is strongly affected by sample rotation

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph