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arXiv · 2505.24367

High resolution up-conversion imaging in the 10 {\mu}m band under incoherent illumination

Zhao-Qi-Zhi Han·Xiao-Hua Wang·Jin-Peng Li·Bo-Wen Liu·Zheng-He Zhou·He Zhang·Yin-Hai Li·Zhi-Yuan Zhou·Bao-Sen Shi
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Abstract

Long-wavelength infrared band exhibits significant utility in thermal signature acquisition and molecular spectral analysis, among other applications. The up-conversion detection technique enables effective signal transduction into the detection bandwidth of silicon-based photodetectors, thereby facilitating high-sensitivity photonic measurements. We realized high-resolution up-conversion imaging for incoherent thermal targets in the 10 {\mu}m spectral regime for the first time. Furthermore, this work presents the first derivation of analytical models characterizing depth of field and astigmatic aberration in up-conversion imaging systems, which show excellent agreement between theoretical and experimental results. The results demonstrate generalisability to various up-conversion imaging systems, thus providing critical insights for the design and optimisation of such systems.

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Zhao-Qi-Zhi Han, Xiao-Hua Wang, Jin-Peng Li, Bo-Wen Liu, Zheng-He Zhou, He Zhang, Yin-Hai Li, Zhi-Yuan Zhou, Bao-Sen Shi. 2025-05-30. High resolution up-conversion imaging in the 10 {\mu}m band under incoherent illumination. https://arxiv.org/abs/2505.24367

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