Excess noise for coherent radiation propagating through amplifying random media

Details Excess noise for coherent radiation propagating through amplifying random media Excess noise for coherent radiation propagating through amplifying random media

1999-01-28

arxiv.org/abs/quant-ph/9901075v1

Phys.Rev. A60 (1999) 4059

Physics

Quantum Physics

8 pages, 6 figures

Scientific paper

10.1103/PhysRevA.60.4059

A general theory is presented for the photodetection statistics of coherent radiation that has been amplified by a disordered medium. The beating of the coherent radiation with the spontaneous emission increases the noise above the shot-noise level. The excess noise is expressed in terms of the transmission and reflection matrices of the medium, and evaluated using the methods of random-matrix theory. Inter-mode scattering between $N$ propagating modes increases the noise figure by up to a factor of $N$, as one approaches the laser threshold. Results are contrasted with those for an absorbing medium.

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