Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of orbital angular momentum on few-cycle pulse shape: Coupling
  between the temporal and angular momentum degrees of freedom   We describe the coupling between orbital angular momentum (OAM) and temporal
degrees of freedom in pulsed Laguerre-Gauss beams. The effects of this coupling
are to increase significantly the duration of few-cycle pulses when the OAM
carried by the pulse is large, and to enhance spatiotemporal couplings.
Contrary to other detrimental but retrievable effects such as spatial, group
velocity and topological charge dispersions in these pulses, OAM-temporal
coupling effects are unavoidable, and have therefore an impact in applications
such as OAM-based optical communications, or in the generation of
vortex-carrying attosecond pulses.

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The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex