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

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

2009-08-27

arxiv.org/abs/0908.4000v2

Phys. Rev. Lett. 103, 233901 (2009)

Physics

Quantum Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.103.233901

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.

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