Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bragg-induced orbital angular-momentum mixing in paraxial high-finesse
  cavities   Numerical calculation of vector electromagnetic modes of plano-concave
microcavities reveals that the polarization-dependent reflectivity of a flat
Bragg mirror can lead to unexpected cavity field distributions for nominally
paraxial modes. Even in a rotationally symmetric resonator, certain pairs of
orbital angular momenta are necessarily mixed in an excitation-independent way
to form doublets. A characteristic mixing angle is identified, which even in
the paraxial limit can be designed to have large values. This correction to
Gaussian theory is zeroth-order in deviations from paraxiality. We discuss the
resulting nonuniform polarization fields. Observation will require small
cavities with sufficiently high Q. Possible applications are proposed.

23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org