Thermal radiation and amplified spontaneous emission from a random medium

Details Thermal radiation and amplified spontaneous emission from a random medium Thermal radiation and amplified spontaneous emission from a random medium

1998-06-22

arxiv.org/abs/quant-ph/9806072v1

Phys. Rev. Lett. 81, 1829 (1998)

Physics

Quantum Physics

4 pages, including 2 figures

Scientific paper

10.1103/PhysRevLett.81.1829

We compute the statistics of thermal emission from systems in which the radiation is scattered chaotically, by relating the photocount distribution to the scattering matrix - whose statistical properties are known from random-matrix theory. We find that the super-Poissonian noise is that of a black body with a reduced number of degrees of freedom. The general theory is applied to a disordered slab and to a chaotic cavity, and is extended to include amplifying as well as absorbing systems. We predict an excess noise of amplified spontaneous emission in a random laser below the laser threshold.

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