Abstract
We report a mid-infrared quartz-enhanced photoacoustic sensor for highly sensitive nitrous oxide (N2O) detection using a 4.56 µm quantum cascade laser (QCL) with a butterfly package type. This new type of QCL features a compact size (30 mm × 12.7 mm × 13 mm), low threshold current (< 120 mA) at room temperature, and relatively high emission power (> 100 mW), which are suitable for portable trace gas sensor development. In this work, the QCL beam is directly coupled to the QEPAS detection module by using only one focusing lens. By measuring N2O mixtures with different concentrations (120 ppb to 3.16 ppm), the developed sensor shows a good linearity (R-square value of 0.999) and a minimum detection limit of below 1 ppb. The sensor has been successfully deployed for ambient air measurement, demonstrating the applicability and promising potential of using this QCL with butterfly package for various gas sensing applications.
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Acknowledgements
This work was supported by the General Research Fund (14208221) from the Research Grants Council, Innovation and Technology Fund (GHP/129/20SZ) from the Innovation and Technology Commission, Hong Kong SAR, China; and National Natural Science Foundation of China (52122003), Shenzhen Science and Technology Innovation Committee (SGDX20210823103535009, RCBS20221008093311028), China.
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MY: Conceptualization, Methodology, Validation, Investigation, Writing – original draft. ZW: Methodology, Investigation, Supervision, Writing – review and editing. HS: Methodology, Validation, Investigation. MH: Validation. PY: Resources. QN: Validation. SL: Resources, Methodology. NA: Resources, Methodology. WR: Conceptualization, Methodology, Writing – review & editing, Supervision, Project administration, Funding acquisition.
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Yang, M., Wang, Z., Sun, H. et al. Highly sensitive QEPAS sensor for sub-ppb N2O detection using a compact butterfly-packaged quantum cascade laser. Appl. Phys. B 130, 6 (2024). https://doi.org/10.1007/s00340-023-08140-6
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DOI: https://doi.org/10.1007/s00340-023-08140-6