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arXiv · 2606.04333

Coincidence-pumping upconversion detector based on passively synchronized fiber laser system

Weiyan Kang·Bowen Li·Yan Liang·Qiang Hao·Ming Yan·Kun Huang·Heping Zeng
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Abstract

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\%. The overall detection efficiency of the upconversion detector reached to 30\% with a low noise equivalent power of $3\times10^{-17}\ \text{W/Hz}^{1/2}$. 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\%. 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.

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Weiyan Kang, Bowen Li, Yan Liang, Qiang Hao, Ming Yan, Kun Huang, Heping Zeng. 2026-06-03. Coincidence-pumping upconversion detector based on passively synchronized fiber laser system. https://doi.org/10.1109/lpt.2020.2965146

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