Detection of trace amount of NO2 gas using tunable blue laser diode

Abdulaziz Aljalal, Sameh Altanany, Khaled Gasmi, Watheq Al-Basheer, Morad Hamad

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations


Nitrogen dioxide, one of the main air pollutants, has strong light absorption cross section in the blue region of the optical spectrum. Recent availability of blue laser diodes provides possibility of detecting NO2 in open-Air paths with very low detection limits. However, in the blue region, the sharp features of the NO2 spectrum is relatively broad with typical width of tenths of nanometer. This poses a serious challenge for implementing traditional direct or wave-modulated tunable diode laser absorption spectroscopy. In this study, we report the usage of a blue laser diode with multi longitudinal modes tuned over about one nanometer in detecting trace amount of NO2 gas. Details of the setup and its optimization will be presented along with a comparison of its performance with other NO2 detection optical methods.

Original languageEnglish
Title of host publicationOptical Sensors 2017
EditorsFrancesco Baldini, Jiri Homola, Robert A. Lieberman
ISBN (Electronic)9781510609631
StatePublished - 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Bibliographical note

Publisher Copyright:
© 2017 SPIE.


  • Absorption spectroscopy
  • Blue diode laser
  • NO detection
  • Nitrogen dioxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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