Institute of Applied Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany.
Center of Smart Interfaces, Technische Universität Darmstadt, 64287 Darmstadt, Germany.
Sci Rep. 2017 Feb 2;7:41866. doi: 10.1038/srep41866.
Initially, ghost imaging (GI) was demonstrated with entangled light from parametric down conversion. Later, classical light sources were introduced with the development of thermal light GI concepts. State-of-the-art classical GI light sources rely either on complex combinations of coherent light with spatially randomizing optical elements or on incoherent lamps with monochromating optics, however suffering strong losses of efficiency and directionality. Here, a broad-area superluminescent diode is proposed as a new light source for classical ghost imaging. The coherence behavior of this spectrally broadband emitting opto-electronic light source is investigated in detail. An interferometric two-photon detection technique is exploited in order to resolve the ultra-short correlation timescales. We thereby quantify the coherence time, the photon statistics as well as the number of spatial modes unveiling a complete incoherent light behavior. With a one-dimensional proof-of-principle GI experiment, we introduce these compact emitters to the field which could be beneficial for high-speed GI systems as well as for long range GI sensing in future applications.
最初，鬼成像（GI）是利用参量下转换产生的纠缠光来演示的。后来，随着热光 GI 概念的发展，引入了经典光源。最先进的经典 GI 光源要么依赖于相干光与空间随机光学元件的复杂组合，要么依赖于具有单色光学元件的非相干灯，但它们会遭受强烈的效率和方向性损失。在这里，提出了一种宽区域超辐射发光二极管作为经典鬼成像的新光源。详细研究了这种光谱宽带发射光电光源的相干行为。利用干涉双光子探测技术来解析超短相关时间尺度。因此，我们量化了相干时间、光子统计以及揭示完全非相干光行为的空间模式数量。通过一维的原理验证实验，我们将这些紧凑型发射器引入该领域，这对于高速 GI 系统以及未来应用中的远程 GI 传感可能是有益的。
