期刊
OPTICS AND LASER TECHNOLOGY
卷 158, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2022.108932
关键词
Mid-infrared; Hollow-core antiresonant fiber; Chalcogenide; Gas sensing
We demonstrate mid-infrared absorption spectroscopy using a chalcogenide glass IG3 hollow-core anti-resonant fiber (HC-ARF) for gas sensing at 10.5 μm. A continuous-wave quantum cascade laser (CW-QCL) is utilized to detect the strong absorption line of ethylene (C2H4) centered at 949.5 cm-1 by coupling the laser beam into a chalcogenide HC-ARF. Both direct absorption spectroscopy (DAS) and wavelength modulation spectroscopy (WMS) are compared, with WMS showing a lower noise equivalent absorption (NEA) coefficient. The combination of QCLs and chalcogenide glass HC-ARFs provides a promising platform for mid-infrared gas sensing applications.
We demonstrate the mid-infrared absorption spectroscopy with a chalcogenide glass IG3 hollow-core anti -resonant fiber (HC-ARF) for gas sensing at 10.5 mu m. A continuous-wave quantum cascade laser (CW-QCL) is adopted to detect the strong absorption line of ethylene (C2H4) centered at 949.5 cm-1 by coupling the laser beam into a chalcogenide HC-ARF of 22 cm in length. Both direct absorption spectroscopy (DAS) and wavelength modulation spectroscopy (WMS) are performed in this study for comparison. At the integration time of 0.1 s, the noise equivalent absorption (NEA) coefficient is determined to be 4.7 x 10-5 cm-1 for DAS and 5.1 x 10-6 cm- 1 for WMS, respectively. Based on the Allan-Werle deviation analysis, the NEA coefficient of WMS can be further improved to 4.0 x 10-7 cm-1 by using a longer integration time of 80 s. The combination of QCLs and chalco-genide glass HC-ARFs provides a promising platform for mid-infrared gas sensing applications.
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