Observation of laser pulse propagation in optical fibers with a SPAD camera.
Observation of laser pulse propagation in optical fibers with a SPAD camera.
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DOI：
10.1038/srep43302
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发表时间：
2017-03-07
影响因子：
4.6
通讯作者：
Leach J
中科院分区：
文献类型：
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作者：
Warburton R;Aniculaesei C;Clerici M;Altmann Y;Gariepy G;McCracken R;Reid D;McLaughlin S;Petrovich M;Hayes J;Henderson R;Faccio D;Leach J
记录发生在亚纳秒时间尺度上的过程和事件是一项艰巨的挑战。传统的超快成像技术通常依赖于长的数据收集时间，这可能是由于有限的设备灵敏度和/或扫描检测系统以形成图像的要求。在这项工作中，我们使用一个单光子雪崩探测器阵列相机与皮秒的定时精度来检测光子散射的光纤中的包层。我们使用这种方法来电影超连续谱产生和跟踪光纤中的GHz脉冲序列。我们还展示了如何通过计算成像来提高阵列有限的空间分辨率。相机的单光子灵敏度和不扫描检测系统导致总采集时间短，根据光照水平低至几秒。我们的结果使我们能够计算不同波段的群指数内的超连续谱产生过程。该技术可以应用于一系列应用，例如，超快过程的表征、时间分辨荧光成像、三维深度成像以及跟踪拐角处隐藏的物体。
Recording processes and events that occur on sub-nanosecond timescales poses a difficult challenge. Conventional ultrafast imaging techniques often rely on long data collection times, which can be due to limited device sensitivity and/or the requirement of scanning the detection system to form an image. In this work, we use a single-photon avalanche detector array camera with pico-second timing accuracy to detect photons scattered by the cladding in optical fibers. We use this method to film supercontinuum generation and track a GHz pulse train in optical fibers. We also show how the limited spatial resolution of the array can be improved with computational imaging. The single-photon sensitivity of the camera and the absence of scanning the detection system results in short total acquisition times, as low as a few seconds depending on light levels. Our results allow us to calculate the group index of different wavelength bands within the supercontinuum generation process. This technology can be applied to a range of applications, e.g., the characterization of ultrafast processes, time-resolved fluorescence imaging, three-dimensional depth imaging, and tracking hidden objects around a corner.