Temporal and spectral control of single-photon frequency upconversion for pulsed radiation

Xiaorong Gu; Kun Huang; Yao Li; Haifeng Pan; Wu, E.; Heping Zeng
March 2010
Applied Physics Letters;3/29/2010, Vol. 96 Issue 13, p131111
Academic Journal
We demonstrate efficient single-photon detection at 1.04 μm with quite low background counts by using the frequency upconversion detection technique with pulsed single-photon source and strong pump field prepared from two synchronized fiber lasers. Temporal and spectral control of the pump and signal lasers enabled an upconversion efficiency of 81.1%. As the system was pumped at a wavelength longer than that of the signal, the corresponding background counts were reduced down to 1.5×103 s-1 due to efficient suppression of parametric fluorescence in the periodic poled lithium niobate crystal.


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