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Opt Lett. 2004 Dec 1;29(23):2794-6.

Experimental demonstration of a pure third-order optical parametric downconversion process.

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Laboratoire de Spectrométrie Physique, Unité Mixte de Recherche 5588, Université Joseph Fourier & Centre National de la Recherche Scientifique, 140 Avenue de la Physique, BP 87, F-38402 Saint Martin d'Heres Cedex, France.


We report what is, to the best of our knowledge, the first experiment on third-order optical difference frequency generation. The nonlinear medium is a phase-matched KTiOPO4 crystal pumped at 532 and 1665 nm in the picosecond regime. The proposed experimental configuration leads to an efficient and pure cubic process, with generation of 4.5 microJ/pulse at 1474 nm. This result opens the way to new quantum experiments on three-photon Greenberger-Horne-Zeilinger entanglement.

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