Opt Lett. 2018 Oct 15;43(20):5025-5028. doi: 10.1364/OL.43.005025.
Ghost imaging is a technique that generates high-resolution images by correlating the intensity of two light beams, neither of which independently contains useful information about the shape of the object. Ghost imaging has been demonstrated in both the spatial and temporal domains, using incoherent classical light sources or entangled photon pairs. Here we exploit the recent progress in ultrafast real-time measurement techniques to demonstrate ultrafast, scan-free, ghost imaging in the frequency domain using a continuous spectrum from an incoherent supercontinuum light source with random spectral fluctuations. We demonstrate the application of this technique to broadband spectroscopic measurements of methane absorption performed with sub-nanometer resolution. Our results offer novel perspectives for remote sensing in low light conditions, or in spectral regions where sensitive detectors are lacking.
鬼成像技术通过关联两束光的强度来生成高分辨率图像，这两束光本身都不包含关于物体形状的有用信息。鬼成像技术已经在空间和时间域中得到了证明，使用非相干的经典光源或纠缠光子对。在这里，我们利用超快实时测量技术的最新进展，使用具有随机光谱波动的非相干超连续光源的连续光谱，在频率域中演示了超快、无扫描的鬼成像。我们演示了该技术在甲烷吸收的宽带光谱测量中的应用，分辨率达到亚纳米级。我们的结果为低光照条件下或敏感探测器缺乏的光谱区域中的遥感提供了新的视角。
