Evolution of blue laser diode spectral lines with applied current in the range 446-448 nm

Watheq Al-Basheer*, Abdulaziz Aljalal, Khaled Gasmi

*Corresponding author for this work

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

1 Scopus citations


High resolution spectral lines study is performed on the emissions of a blue laser diode as a function of applied current. The range of applied current used is between the threshold current of 20 mA and 100 mA with a 0.2 mA increment. With this range of current, the observed emission spectra are between 446 and 448 nm. Typically, 21 longitudinal modes are observed with a mode spacing of 0.05 nm. This mode spacing is found to be in good agreement with the predicted values calculated using the GaN index of refraction and the length of laser cavity. The peak location of each longitudinal mode is measured to shift uniformly with a rate of 0.0045 nm/mA. The intensity and wavelength of each longitudinal mode are observed to be stable over extended period of time. Selected longitudinal modes will be employed to detect traces of pollution gases.

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.


  • Blue laser diode
  • Fabry-Perot
  • Gallium Nitride
  • Longitudinal Modes
  • 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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