Krzempek Karol, Abramski Krzysztof, Nikodem Michal
Laser & Fiber Electronics Group, Faculty of Electronics, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
Department of Optics and Photonics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland.
Sensors (Basel). 2019 Jul 31;19(15):3352. doi: 10.3390/s19153352.
In this paper, we demonstrate the laser-based gas sensing of methane near 3.3 µm inside hollow-core photonic crystal fibers. We exploit a novel anti-resonant Kagome-type hollow-core fiber with a large core diameter (more than 100 µm) which results in gas filling times of less than 10 s for 1.3-m-long fibers. Using a difference frequency generation source and chirped laser dispersion spectroscopy technique, methane sensing with sub-parts-per-million by volume detection limit is performed. The detection of ambient methane is also demonstrated. The presented results indicate the feasibility of using a hollow-core fiber for increasing the path-length and improving the sensitivity of the mid-infrared gas sensors.
在本文中，我们展示了基于激光的中空光子晶体光纤内3.3 µm附近甲烷气体传感。我们采用了一种新型的反谐振 Kagome 型大芯径（超过100 µm）中空光纤，对于1.3米长的光纤，其气体填充时间小于10秒。使用差频产生源和啁啾激光色散光谱技术，实现了体积分数检测限低于百万分之一的甲烷传感。还展示了对环境中甲烷的检测。所呈现的结果表明了使用中空光纤来增加光程长度并提高中红外气体传感器灵敏度的可行性。
