Measurement of Coupling PDC photon sources with single-mode and multimode optical fibers

Details Measurement of Coupling PDC photon sources with single-mode and multimode optical fibers Measurement of Coupling PDC photon sources with single-mode and multimode optical fibers

2004-08-03

arxiv.org/abs/quant-ph/0408015v1

Physics

Quantum Physics

13 pages, 12 figures

Scientific paper

We investigate the coupling efficiency of parametric downconversion light (PDC) into single and multi-mode optical fibers as a function of the pump beam diameter, crystal length and walk-off. We outline two different theoretical models for the preparation and collection of either single-mode or multi-mode PDC light (defined by, for instance, multi-mode fibers or apertures, corresponding to bucket detection). Moreover, we define the mode-matching collection efficiency, important for realizing a single-photon source based on PDC output into a well-defined single spatial mode. We also define a multimode collection efficiency that is useful for single-photon detector calibration applications.

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