Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin to orbital angular momentum transfer in nonlinear wave mixing   We demonstrate the spin to orbital angular momentum transfer in the nonlinear
mixing of structured light beams. A vector vortex is coupled to a circularly
polarized Gaussian beam in noncollinear second harmonic generation under
type-II phase match. The second harmonic beam inherits the Hermite-Gaussian
components of the vector vortex, however, the relative phase between them is
determined by the polarization state of the Gaussian beam. This effect creates
an interesting crosstalk between spin and orbital degrees of freedom, allowing
the angular momentum transfer between them. Our experimental results match the
theoretical predictions for the nonlinear optical response.

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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph