We consider the intensity pattern, generated by a monochromatic source, in a disordered cavity coupled to the environment. For weak coupling, and when the source frequency is tuned to a resonance, the intensity distribution $P(I)$ is close to Porter-Thomas distribution. When the coupling increases, $P(I)$ gradually crosses over to the Rayleigh distribution. The joint probability distribution for intensities at two different points is also discussed.
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Pnini et al. (1996) studied this question.
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