We have proposed and implemented an all-optical passive synchronization fiber laser system, which was used to facilitate high-performance coincidence frequency upconversion detection for infrared photons. Thanks to the intensive peak power and spectro-temporal pulse engineering, the conversion efficiency could be boosted up to 80% for near- and mid-infrared signal photons. Meanwhile, the background noise was substantially suppressed by confining the pump-induced noise within a narrow excitation window. The demonstrated ultra-sensitive upconversion detector would find promising applications in remote sensing, long-distance ranging and trace detection.
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