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Applied Physics B

, 125:62 | Cite as

Detection of elemental mercury using a frequency-doubled diode laser with wavelength modulation spectroscopy

  • Xiutao LouEmail author
  • Lianjie Xu
  • Yongkang Dong
  • Tie Zhang
  • Li Wan
  • Sailing He
Article
  • 62 Downloads

Abstract

We demonstrate a new method for elemental mercury sensing by wavelength modulation spectroscopy (WMS) using a tunable ultraviolet laser generated through a process of second-harmonic generation (SHG). The WMS is implemented by fast modulating the injection current of the Fabry–Perot-type green diode laser equipped with a Littrow grating to increase the laser-mode power density. The technique of correlation spectroscopy is exploited to deal with the signal variations due to mode hops and guarantee the measurement accuracy. According to the performance evaluation, the SHG-WMS system exhibits a better sensitivity (0.15 µg/m3 for 1-m pathlength with an integration time of 10 s) and a comparably high linearity (R2 = 0.9995 within the range of 60 µg/m2) compared with the direct absorption scheme. The employment of WMS significantly simplifies the data processing for extraction of small mercury absorption signals from the large and complex SHG light background, and, thus, give robust measurement results. High-harmonic (4f and 6f) detections are also carried out, showing a great potential for suppression of large residual amplitude modulation background. The proposed SHG-WMS system shows great promise for rapid and sensitive mercury sensing in industrial fields.

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant nos. 61775049 and 61575052), Jiangsu Provincial Key Research and Development Program (BE2015653), and the National Key Research and Development Program of China (2018YFC1407503).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Xiutao Lou
    • 1
    Email author
  • Lianjie Xu
    • 1
  • Yongkang Dong
    • 2
  • Tie Zhang
    • 3
  • Li Wan
    • 4
  • Sailing He
    • 3
  1. 1.Department of PhysicsHarbin Institute of TechnologyHarbinChina
  2. 2.National Key Laboratory of Science and Technology on Tunable LaserHarbin Institute of TechnologyHarbinChina
  3. 3.Centre for Optical and Electromagnetic Research, National Engineering Research Center for Optical InstrumentsZhejiang UniversityHangzhouChina
  4. 4.Suzhou Reliatek Environmental Technology Co., Ltd.ChangshuChina

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