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Updated: May 18, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
Detection of the ultranarrow temporal correlation of twin beams via sum-frequency generation
O Jedrkiewicz1, J-L Blanchet, E Brambilla
1CNISM and Dipartimento di Alta Tecnologia, Università dell'Insubria, Via Valleggio 11, Como, Italy.
Abstract:
We demonstrate the ultranarrow temporal correlation (6 fs full width half maximum) of twin beams generated by parametric down-conversion by using its reverse process, i.e., sum-frequency generation. The result relies on an achromatic imaging of a huge bandwidth of twin beams and on a careful control of their spatial degrees of freedom. The detrimental effects of spatial filtering and imperfect imaging are shown, along with the theoretical model used to describe the results.
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