Abstract

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 µJ/pulse at 1474 nm. This result opens the way to new quantum experiments on three-photon Greenberger–Horne–Zeilinger entanglement.

© 2004 Optical Society of America

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