Zhou Guorui, Xiang Siheng, You Hui, Li Chunling, Niu Longfei, Jiang Yilan, Miao Xinxiang, Xie Xiufang
Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China.
Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China.
Sensors (Basel). 2022 Feb 16;22(4):1520. doi: 10.3390/s22041520.
The impact of airborne molecular contaminants (AMCs) on the lifetime of fused silica UV optics in high power lasers (HPLs) is a critical issue. In this work, we demonstrated the on-line monitoring method of AMCs concentration based on the Sagnac microfiber structure. In the experiment, a Sagnac microfiber loop with mesoporous silica coating was fabricated by the microheater brushing technique and dip coating. The physical absorption of AMCs in the mesoporous coating results in modification of the surrounding refractive index (RI). By monitoring the spectral shift in the wavelength domain, the proposed structure can operate as an AMCs concentration sensor. The sensitivity of the AMCs sensor can achieve 0.11 nm (mg/m). By evaluating the gas discharge characteristic of four different low volatilization greases in a coarse vacuum environment, we demonstrated the feasibility of the proposed sensors. The use of these sensors was shown to be very promising for meeting the requirements of detecting trace amounts of contaminants.
空气中的分子污染物（AMC）对高功率激光器（HPL）中熔融石英紫外光学元件寿命的影响是一个关键问题。在这项工作中，我们展示了基于萨尼亚克微纤维结构的AMC浓度在线监测方法。实验中，采用微加热器刷涂技术和浸涂法制备了具有介孔二氧化硅涂层的萨尼亚克微纤维环。AMC在介孔涂层中的物理吸附导致周围折射率（RI）发生变化。通过监测波长域中的光谱位移，所提出的结构可作为AMC浓度传感器。该AMC传感器的灵敏度可达0.11 nm/（mg/m）。通过评估四种不同低挥发性润滑脂在粗真空环境中的气体放电特性，我们证明了所提出传感器的可行性。结果表明，使用这些传感器对于满足痕量污染物检测要求非常有前景。
