Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single envelope equation modelling of multi-octave comb arrays in
  microresonators with quadratic and cubic nonlinearity   We numerically study, by means of the single envelope equation, the
generation of optical frequency combs ranging from the visible to the
mid-infrared spectral regions in resonators with quadratic and cubic
nonlinearities. Phase-matched quadratic wave-mixing processes among the comb
lines can be activated by low-power continuous wave pumping in the near
infrared of a radially poled lithium niobate whispering gallery resonator
(WGR). We examine both separate and co-existing intra-cavity doubly resonant
second-harmonic generation and parametric oscillation processes, and find that
modulation instabilities may lead to the formation of coupled comb arrays
extending over multiple octaves. In the temporal domain, the frequency combs
may correspond to pulse trains, or isolated pulses.

29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph