Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatiotemporal pulses in a liquid crystal optical oscillator   A nonlinear optical medium results by the collective orientation of liquid
crystal molecules tightly coupled to a transparent photoconductive layer. We
show that such a medium can give a large gain, thus, if inserted in a ring
cavity, it results in an unidirectional optical oscillator. Dynamical regimes
with many interacting modes are made possible by the wide transverse size and
the high nonlinearity of the liquid crystals. We show the generation of
spatiotemporal pulses, coming from the random superposition of many coexisting
modes with different frequencies.

20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg