Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental observation of anisotropic diffraction induced by orbital
  angular momentum   We reveal for the first time a direct relationship between the diffraction of
optical beams and their carrying orbital angular momentum (OAM). We
experimentally demonstrate a novel phenomenon that the anisotropic diffraction
can be induced by the OAM, predicted by us [Opt. Express, \textbf{26}, 8084
(2018)], via the propagations of the elliptic beams with the OAM in linearly
and both-linearly-and-nonlinearly isotropic media, respectively. In the former
case, when its carrying OAM equals the so-called critical OAM, the spiraling
elliptic Gaussian beam (fundamental eigenmode) is observed in the free space,
where only the eigenmode with cylindrical-symmetry is supposed to exist for the
beam without the OAM. In the latter case, the spiraling elliptic soliton,
predicted by Desyatnikov et al. [Phys. Rev. Lett, \textbf{104}, 053902 (2010)],
is observed to stably propagate in a cylindrical lead glass. The
power-controllable rotation of such an elliptic beam is also experimentally
demonstrated.

20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
2
The categories of this paper are: math
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th