Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of an adjustable quarter-wave system under condition of
  multiple beam interference   The polarimetric properties of an adjustable two plate quarter-wave system
have been investigated. Multiple beam interference within single wave-plates
has been taken into account. It has been shown that different adjustments are
needed to produce left-handed and right-handed circular polarized coherent
light. Laser light polarization conversion by the systems consisting of two
birefringent mica plates has been investigated experimentally. The high-quality
circularly polarized light with the intensity-related ellipticity higher than
0.99 has been produced.

28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga