Statistical studies of random lasing modes and amplified spontaneous emission spikes in weakly scattering systems

Details Statistical studies of random lasing modes and amplified spontaneous emission spikes in weakly scattering systems Statistical studies of random lasing modes and amplified spontaneous emission spikes in weakly scattering systems

2007-12-17

arxiv.org/abs/0712.2807v1

Physics

Optics

25 pages, 8 figures

Scientific paper

10.1103/PhysRevA.77.013832

We measured the ensemble-averaged spectral correlation functions and statistical distributions of spectral spacing and intensity for lasing modes in weakly scattering systems, and compared them to those of the amplified spontaneous emission spikes. Their dramatic differences illustrated the distinct physical mechanisms. Our numerical simulation revealed that even without reabsorption the number of potential lasing modes might be greatly reduced by local excitation of a weakly scattering system. The lasing modes could be drastically different from the quasimodes of the passive system due to selective amplification of the feedback from the scatterers within the local gain region.

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