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Opt Lett. 2006 Mar 15;31(6):793-5.

Efficient and stable single-photon counting at 1.55 microm by intracavity frequency upconversion.

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  • 1Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China.


A single-photon signal at 1.55 microm was converted to the visible region by sum-frequency mixing with a strong pumping beam at 1064 nm in a periodically poled lithium niobate crystal placed in a diode-pumped Nd:YVO4 laser cavity. As the intracavity pump laser could be automatically stabilized without cavity lock, robust long-term stability was demonstrated for single-photon frequency upconversion, with a conversion efficiency of 74.3%. Such a stable single-photon upconversion was demonstrated to be efficient and robust for single-photon counting at 1550 nm, and the corresponding background noise was measured at less than 420 x 10(3) s(-1).

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