Coincidence-Pumping Upconversion Detector Based on Passively Synchronized Fiber Laser System

摘要

We experimentally demonstrated a high-performance frequency upconversion detector for telecom-band photons based on a passively synchronized fiber laser system. The involved coincidence pumping technique enabled to spectrally convert the pulsed infrared photons into the visible regime with a conversion efficiency of 72& x0025;. The overall detection efficiency of the upconversion detector reached to 30& x0025; with a low noise equivalent power of $3imes 10<^>{-17},,ext {W/Hz}<^>{1/2}$ . In contrast to previous demonstrations, the whole upconversion detection system was constructed in an all-polarization-maintaining fiber structure, thus favoring substantial improvement of compactness and robustness. Moreover, the long-term stability was manifested by at least ten-hour operation with a relative fluctuation of count rates as small as 0.26& x0025;. The achieved features here would be desirable in many practical applications requiring efficient and robust coherent manipulation of pulsed optical fields by nonlinear frequency conversion.