Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Femtosecond superradiance in multiple-section InGaN/GaN quantum well
  laser structures   We analyze theoretically a possibility of the superradiant emission (SR) in
GaN-based quantum well (QW) laser heterostructures. Our model is based on
travelling wave Maxwell-Bloch equations predicts building up of macroscopic
coherences in the ensemble of carriers in the QWs. We show that SR is covered
by the Ginzburg-Landau equation for phase transition to coherent matter state.
The generation of superradiant pulses as short as 500 fs at peak powers of over
200 W has been predicted for InGaN/GaN heterostructure QWs with the peak
emission in the blue/violet wavelength range.

15
The categories of this paper are: nucl-ex
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
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs