AI 中文总结
研究中红外光谱成像难题，基于非线性频率下转换方案，通过可编程光谱滤波器和非线性晶体实现计算鬼成像光谱技术，获0.62 cm-1光谱分辨率，为中红外相关领域提供新途径。
AI 中文摘要
光谱域鬼成像能够利用单像素探测器实现高分辨率光谱学。该技术不依赖光谱分辨探测器，对湍流具有固有鲁棒性，尤其适用于弱光条件，这对中红外区域的光谱成像极具吸引力，但此前受限于缺乏合适光源和实时测量光谱波动的探测器。本文基于非线性频率下转换方案展示了中红外光谱域计算鬼成像。通过可编程光谱滤波器将预编程光谱图案施加于1.5毫米宽带光，经非线性晶体中的差频产生转移至中红外。利用单像素中红外探测器实现了0.62厘米-1光谱分辨率的计算鬼成像光谱技术。该方法灵活且广泛适用，分别利用啁啾极化铌酸锂晶体和ZnGeP2晶体中的非线性频率转换，在中波红外和长波红外波段演示了鬼成像光谱技术，为中红外光谱学、遥感和光谱成像提供了新途径。
英文摘要
Spectral-domain ghost imaging enables high-resolution spectroscopy with a single-pixel detector. The technique does not rely on spectrally resolved detectors, which makes it inherently robust against turbulence and particularly adapted to weak-light conditions. These features are very attractive for spectral imaging in the mid-infrared region which hosts numerous molecular absorption features but lacks highly sensitive detectors. The implementation of spectral ghost imaging in the mid-infrared has however been limited by the absence of suitable light sources and detectors capable of generating and measuring spectral fluctuations in real time. Here, we demonstrate spectral-domain computational ghost imaging in the mid-infrared based on a nonlinear frequency downconversion scheme. Pre-programmed spectral patterns imposed on broadband light at 1.5 mm using a programmable spectral filter are transferred into the mid-infrared through difference-frequency generation in a nonlinear crystal. This enables computational ghost spectroscopy with a spectral resolution of 0.62 cm-1 using a single-pixel mid-infrared detector. The method is flexible, broadly applicable and, as proof of concept, we demonstrate ghost spectroscopy in mid-wavelength infrared and long-wavelength infrared bands using the nonlinear frequency conversion in chirped-poling lithium niobate and ZnGeP2 crystals, respectively. Our approach provides a new avenue for mid-infrared spectroscopy, remote sensing and spectral imaging.
Comments23 pages, 8 figures
