Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong Interactions in Multimode Random Lasers   Unlike conventional lasers, diffusive random lasers (DRLs) have no resonator
to trap light and no high-Q resonances to support lasing. Due to this lack of
sharp resonances the DRL has presented a challenge to conventional laser
theory. We present a theory able to treat the DRL rigorously, and provide
results on the lasing spectra, internal fields and output intensities of DRLs.
Typically DRLs are highly multimode lasers, emitting light at a number of
wavelengths. We show that the modal interactions through the gain medium in
such lasers are extremely strong and lead to a uniformly spaced frequency
spectrum, in agreement with recent experimental observations.

24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg