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

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.

4 pages, 5 figures

References in corpus (7)

• Spectral structure and decompositions of optical states, and their applications
• Spatial modes in waveguided parametric down-conversion
• Quantum Multiplexing with the Orbital Angular Momentum of light
• Modal, Spectral, and Polarization Entanglement in Guided-Wave Parametric Down-Conversion
• Integrated optical source of polarization entangled photons at 1310 nm
• Broadband frequency mode entanglement in waveguided PDC
• Experimental characterization of three-wave mixing in a multimode nonlinear KTiOPO_4 waveguide

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