Krzempek Karol
Opt Express. 2021 Sep 27;29(20):32568-32579. doi: 10.1364/OE.435675.
In this work, I demonstrate a novel configuration of a photothermal gas sensor. Detection of nitric oxide at a wavelength of 5.26 µm was possible by constructing an absorption cell based on a self-fabricated antiresonant hollow core fiber characterized by low losses at both the pump and probe wavelengths. Proper design of the sensor allowed using the heterodyne interferometry-based signal readout of the refractive index modulation, which yielded a record noise equivalent absorption of 2.81×10 cm for 100 s integration time for mid-infrared fiber-based gas sensors. The obtained results clearly demonstrate the full potential of using properly designed antiresonant hollow core fibers in combination with sensitive gas detection methods.
在这项工作中，我展示了一种光热气体传感器的新型配置。通过基于自制的反谐振空心光纤构建吸收池，在5.26 µm波长处检测一氧化氮成为可能，该光纤在泵浦波长和探测波长处均具有低损耗特性。传感器的合理设计使得能够使用基于外差干涉测量法的折射率调制信号读出，对于基于中红外光纤的气体传感器，在100 s积分时间内产生了创纪录的2.81×10⁻⁵ cm的噪声等效吸收。所获得的结果清楚地证明了将设计合理的反谐振空心光纤与灵敏的气体检测方法相结合的全部潜力。
