Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization Retarder with Cylindrical-Symmetry for Radially Polarized
  Light   We demonstrate a cylindrically-symmetric polarization retarder for generating
exact radially polarized light. It involves an uni-axial crystal whose
crystallographic optics axis is aligned to its optical axis. This method offers
high power-handling capability

31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin