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- Title
Mid-Infrared Frequency Modulation Spectroscopy of NO Detection in a Hollow-Core Antiresonant Fiber.
- Authors
Hu, Mengyuan; Ventura, Andrea; Hayashi, Juliano Grigoleto; Poletti, Francesco; Ren, Wei
- Abstract
Mid-infrared frequency modulation spectroscopy (FMS) in a tellurite hollow-core antiresonant fiber (HC-ARF) is investigated for gas detection. The spectroscopic system is demonstrated for nitric oxide (NO) detection by exploiting its strong absorption line at 1900.08 cm−1 with a quantum cascade laser (QCL). By modulating the injection current of the QCL at 250 MHz and measuring NO in a 35 cm long HC-ARF, we achieve a noise equivalent concentration of 67 ppb at an averaging time of 0.1 s. Compared to direct absorption spectroscopy with a low-pass filter for etalon noise reduction, the FMS technique shows an improvement factor of 22. The detection limit of FMS can be further improved to 6 ppb at a longer averaging time of 100 s, corresponding to a noise equivalent absorption coefficient of 1.0 × 10−7 cm−1.
- Subjects
MODULATION spectroscopy; QUANTUM cascade lasers; PHOTOACOUSTIC spectroscopy; NOISE control; ABSORPTION coefficients; FIBERS; DETECTION limit
- Publication
Photonics, 2022, Vol 9, Issue 12, p935
- ISSN
2304-6732
- Publication type
Article
- DOI
10.3390/photonics9120935