Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiple quasi-perfect vector vortex beams with arbitrary 3D position on
  focus   In this paper we show a method for creating multiple independent
quasi-perfect vector vortex beams with real-time programmable radii,
topological charges, polarization orders and position in 3 dimensions, using a
device based on a phase-only liquid crystal on silicon display. We achieved the
simultaneous generation of up to 7 independent beams, with topological charges
from -3 to 3, and found great agreement between the simulated and the measured
phases and polarization structures. Additionally, we used the same scheme for
enhancing the depth of focus of a single beam, resulting in a "tube" beam that
preserves its properties during propagation.

33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci