Direct transfer of pump amplitude to parametric down-converted photons

Optics Letters
Ali AnwarR P Singh

Abstract

In general, the spatial distribution of individual photons (signal or idler) generated by spontaneous parametric down-conversion (SPDC) does not evidently show any particular spatial mode structure because of their randomness in generation and the incoherent nature. Here, we numerically showed that all individual photons generated by the SPDC process carry the transverse amplitude as that of the pump and then confirmed it experimentally. The pump amplitude is revealed in SPDC when individual photons are spatially filtered from the total SPDC distribution. This is observed simply by imaging the photons that are filtered using a minimum-sized aperture. The phase measurements showed that the observed mode distribution does not possess the transverse phase distribution as that of the pump.

References

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Dec 12, 2007·Optics Letters·M J Padgett, J Courtial
Nov 29, 2012·Optics Express·Melanie McLarenAndrew Forbes
Feb 8, 2013·Optics Express·Héctor Cruz-RamírezAlfred B U'Ren
Oct 17, 2014·Optics Express·Verónica Vicuña-HernándezAlfred B U'Ren
Feb 26, 2016·Applied Optics·A AadhiR P Singh

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