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We study the propagation of radiation through a disordered waveguide with a complex dielectric constant {ε}, and show that dual systems, which differ only in the sign of the imaginary part of {ε}, have the same localization length. Paradoxically, absorption and stimulated emission of radiation suppress the transmittance of the waveguide in the same way. {} 1996 The American Physical Society.
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Paasschens et al. (1996) studied this question.
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