Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Description of a multifocal arrangement of asymmetric Kummer-beam
  optical vortices   In this work, an analytic expression is derived for the optical field
generated by an off-axis Gaussian beam diffracted by a Discrete
Vortex-Producing Lens. With this system, a multifocal arrangement of asymmetric
optical vortices is obtained whose topological charge values change with the
position along the optical axis. This scheme allows obtaining a principal
asymmetric vortex corresponding with the topological charge value of the phase
mask and secondary ones with different charges. With the analytical expression,
the effects induced by the discretization and misalignment on the irradiance
and phase of each vortex can be simultaneously studied. A signal-to-noise ratio
expression is derived to verify if the noise of the multifocal system might
affect importantly the optical vortices of interest. Finally, we proposed new
metrics to measure the off-axis displacement using the phase of the vortex. We
concluded that noise is not a problem, then a Discrete Vortex-Producing Lens
can be used as a continuous Spiral Phase Plate with the bonus that secondary
optical vortices can be used in the same way as principal optical vortices.

12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th