Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Frequency comb generation in quadratic nonlinear media   We experimentally demonstrate and theoretically explain the onset of optical
frequency combs in a simple cavity-enhanced second-harmonic-generation system,
exploiting second-order nonlinear interactions. Two combs are simultaneously
generated around the fundamental pump frequency, with a spectral bandwidth up
to about 10 nm, and its second harmonic. We observe different regimes of
generation, depending on the phase-matching condition for
second-harmonic-generation. Moreover, we develop an elemental model which
provides a deep physical insight into the observed dynamics. Despite the
different underlying physical mechanism, the proposed model is remarkably
similar to the description of third-order effects in microresonators, revealing
a potential variety of new effects to be explored and laying the groundwork for
a novel class of highly efficient and versatile frequency comb synthesizers
based on second-order nonlinear materials.

34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn