Direct measurement of the spatial-spectral structure of waveguided parametric down-conversion

Peter James Mosley, Andreas Christ, Andreas Eckstein, Christine Silberhorn

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60 Citations (SciVal)


We present a study of the propagation of higher-order spatial modes in a waveguided parametric down-conversion photon-pair source. Observing the multimode photon-pair spectrum from a periodically poled KTiOPO4 waveguide allowed us to isolate individual spatial modes through their distinctive spectral properties. We have measured directly the spatial distribution of each mode of the photon pairs, confirming the findings of our waveguide model, and demonstrated by coincidence measurements that the total parity of the modes is conserved in the nonlinear interaction. Furthermore, we show that we can combine the advantages of a waveguide source with the potential to generate spatially entangled photon pairs as in bulk-crystal down-converters.
Original languageEnglish
Article number233901
Number of pages4
JournalPhysical Review Letters
Issue number23
Early online date2 Dec 2009
Publication statusPublished - 4 Dec 2009


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