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Opt Lett. 2005 Apr 15;30(8):908-10.

Measurement of the spectral properties of the two-photon state generated via type II spontaneous parametric downconversion.

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  • 1Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea.


We report complete measurement of the spectral properties of photon pairs generated via spontaneous parametric downconversion. The measurements, which include not only single-photon spectra but also two-photon joint spectra, were performed for both cw and ultrafast-pumping configurations. In agreement with theoretical predictions, the spectra for the ultrafast-pumped case reveal asymmetries that are not present with cw pumping.

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