Regine Frank, Janos Sartor, Heinz Kalt
The co-existence of two spectrally well separated and though fundamentally different, spatially overlapping types of random lasing modes is a phenomenon which has never been derived to full extent in theory. Here a framework of diagrammatic transport theory including self-consistent nonlinear enhancement and dissipation in the multiple scattering regime is proposed which yields qualitatively and quantitatively both types and diameters of random laser modes and their degree of coherence. The model is fit-parameter-free and the comparison with the experiment shows that our results hold up to volume filling of more than 60% of arbitrarily positioned ZnO Mie scatters.
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http://arxiv.org/abs/1209.3111
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