Investigating temperature effects on the spectral lines of blue laser diodes for monitoring NO2 gas pollution

Khaled Gasmi*, Watheq Al-Basheer, Abdulaziz Aljalal

*Corresponding author for this work

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


Temperature effects on the spectral lines of two Fabry-Perot GaN-based blue laser diodes obtained from Toptica and Roithner Laser Tech are experimentally investigated over the temperature range 5 °C to 60 °C in steps of 0.5 °C. A high resolution monochromator SPEX 1403 with a nominal resolution of 0.003 nm is used in this study. A detailed comparison on the number of modes, mode spacing, emission range and change of emission wavelength per degree Celsius will be presented in this paper. The results of this comparison are used to investigate the suitability of the employment of these laser diodes in open-path detection of NO2 gas pollution.

Original languageEnglish
Title of host publicationOptical Sensors 2015
EditorsFrancesco Baldini, Robert A. Lieberman, Jiri Homola
ISBN (Electronic)9781628416275
StatePublished - 2015

Publication series

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

Bibliographical note

Publisher Copyright:
© 2015 SPIE.


  • Fabry-Perot
  • GaN-based blue laser diode
  • Longitudinal modes evolution
  • Mode spacing

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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