Detection of the ultranarrow temporal correlation of twin beams via sum-frequency generation
Jedrkiewicz, O. · Blanchet, J. -L. · Brambilla, E. · Di Trapani, P. · Gatti, A.
Original · EN
We demonstrate the ultranarrow temporal correlation (6 fs full width half maximum) of twin beams generated by parametric down-conversion, by using the inverse process of sum-frequency generation. The result relies on an achromatic imaging of a huge bandwith of twin beams and on a careful control of their spatial degrees of freedom. The detrimental effects of spatial filtering and of imperfect imaging are shown toghether with the theoretical model used to describe the results.
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