Efficient single-photon frequency upconversion at 1.06 μm with ultralow background counts

Huafang Dong; Haifeng Pan; Li, Yao; Wu, E.; Heping Zeng
August 2008
Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p071101
Academic Journal
We demonstrated an efficient single-photon frequency upconversion system for the infrared photons at 1.06 μm with ultralow background counts. By pumping the system at a longer wavelength than that of the single-photon signal, the background counts caused by the pump-induced parametric fluorescence in the nonlinear crystal were reduced markedly. We achieved so far the lowest noise of ∼150 /s for a near unity conversion efficiency.


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