High-resolution investigation of longitudinal modes of a GaN-based blue laser diode

Watheq Al-Basheer*, Abdulaziz Aljalal, Khaled Gasmi, Taofeek O. Adigun

*Corresponding author for this work

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

3 Scopus citations


Typical emission spectra of GaN-based blue laser diodes are known to have irregular shapes. Hence, well-resolved study of their spectra may help in understanding the origin of their spectral shapes irregularity. In this paper, the spectra of a commercial GaN-based blue laser diode are studied as a function of injection current and temperature using a spectrometer with highresolution of 0.003-nm over the spectral region 440-450 nm. The obtained laser spectra are used to track the longitudinal modes evolution as a function of operating currents and temperatures as well as to precisely map single mode operation. In addition, yielded laser spectra will be utilized to evaluate few parameters related to the laser diode, such as mode spacing, optical gain, slope efficiency and threshold current at certain temperature.

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.


  • 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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