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arXiv:2305.03480 · Physical Review Applied

Midinfrared up-conversion imaging under different illumination conditions

Zheng Ge, Zhao-Qi-Zhi Han, Yiyang Liu, Xiao-Hua Wang, Zhi‐Yuan Zhou, Fan Yang, Yin‐Hai Li, Yan Li, Li Chen, Wu‐Zhen Li, Sujian Niu, Bao-Sen Shi

Published Nov 29, 2023• 30 citations
arXivHTMLPDF

Abstract

Converting the medium-emitting infrared field to the visible band is an effective image-detection method. We propose a comprehensive theory of image up-conversion under continuous optical pumping, and discuss the relationship between the experimental parameters and imaging field of view, resolution, quantum efficiency, and conversion bandwidth. Theoretical predictions are given based on numerical simulations, which show good agreement with experimental results. In particular, coherent and incoherent light illumination are studied separately and the advantages and disadvantages of their imaging performance are compared and analyzed. This work provides a detailed study of the up-conversion image detection performance of the system, which is of great value in guiding the design of the detection system and bringing it to practical applications.

DOI
10.1103/physrevapplied.20.054060

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Converting the medium-emitting infrared field to the visible band is an effective image-detection method. We propose a comprehensive theory of image up-conversion under continuous optical pumping, and discuss the relationship between the experimental parameters and imaging field of view, resolution, quantum efficiency, and conversion bandwidth. Theoretical predictions are given based on numerical simulations, which show good agreement with experimental results. In particular, coherent and incoherent light illumination are studied separately and the advantages and disadvantages of their imaging performance are compared and analyzed. This work provides a detailed study of the up-conversion image detection performance of the system, which is of great value in guiding the design of the detection system and bringing it to practical applications.
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The intensity transverse profile of the light produced in the process of stimulated down-conversion is derived. A quantum-mechanical treatment is used. We show that the angular spectrum of the pump laser can be transferred to the stimulated down-converted beam, so that images can also be transferred from the pump to the down-converted beam. We also show that the transfer can occur from the stimulating beam to the down-converted one. Finally, we study the process of diffraction through an arbitrarily shaped screen. For the special case of a double-slit, the interference pattern is explicitly obtained. The visibility for the spontaneous emitted light is in accordance with the van Cittert--Zernike theorem for incoherent light, while the visibility for the stimulated emitted light is unity. The overall visibility is in accordance with previous experimental results.
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