Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cancellation of simple optical anisotropies without use of a Faraday
  mirror   We first derive the round-trip Jones matrix for double passage through a
reciprocal optical medium by means of reflection off a plane mirror that could
be optically anisotropic. We then show that if a medium with only linear
birefringence and linear dichroism is placed between a pair of orthogonal
quarterwave plates with principal axes at 45 deg to that of the medium and the
sandwich is placed in front of an isotropic mirror it behaves, under double
passage, like an isotropic medium. We describe a simple liquid crystal device
that behaves, in reflection, as an isotropic medium whose refractive index can
be varied by application of an electric field, thus acting as a phase only
modulator for light in any polarization state.

19
The categories of this paper are: eess
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio