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Phys Rev Lett. 2003 Mar 14;90(10):106401. Epub 2003 Mar 11.

Polariton parametric amplifier pump dynamics in the coherent regime.

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Laboratoire de Physique de la Matière Condensée, Ecole Normale Supérieure, 24, rue Lhomond, F-75005 Paris, France.


We studied the pump coherent dynamics in a II-VI microcavity parametric amplifier, using angle-resolved four-wave mixing. The polariton parametric amplification is found to result in a strong quenching and saturation of the pump coherence lifetime above the threshold. For the polariton scattering processes that remain below the amplification threshold, we find an angle-dependent collision broadening associated with the efficiency of the polariton scattering towards the excitonic reservoir.

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