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Direct Measurement of the Spatial-Spectral Structure of Waveguided Parametric Down-Conversion

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Mosley,  Peter J.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Christ,  Andreas
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Eckstein,  Andreas
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Silberhorn,  Christine
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Mosley, P. J., Christ, A., Eckstein, A., & Silberhorn, C. (2009). Direct Measurement of the Spatial-Spectral Structure of Waveguided Parametric Down-Conversion. PHYSICAL REVIEW LETTERS, 103(23): 233901. doi:10.1103/PhysRevLett.103.233901.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6B8D-6
Abstract
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 KTiOPO(4) 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.