Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chaotic beats in a nonautonomous system governing second-harmonic
  generation of light   The letter proposes a procedure for generation and control chaotic beats in a
dynamical system being initially in the periodic state. The dynamical system
describes a simple nonlinear optical process -- second-harmonic generation of
light. The periodic states of the system have been found in analytical forms.
We also investigate some aspects of synchronization of chaotic beats in two
systems, detuned in the pump fields.

18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an