Title :
Oxygen sensing using single frequency GaAs-AlGaAs DFB laser diodes and VCSELs
Author :
Weldon, V. ; O´Gorman, J. ; Pérez-Camacho, J.J. ; Hegarty, J.
Author_Institution :
Dept. of Phys., Trinity Coll., Dublin, Ireland
fDate :
2/1/1996 12:00:00 AM
Abstract :
Oxygen detection using a GaAs-AlGaAs distributed feedback laser diode emitting at a wavelength of 761 nm is demonstrated for the first time. Using wavelength modulation spectroscopy with harmonic detection the authors have achieved a detection limit of 20 ppm.m with a lock-in amplifier time constant of 33.3 ms. The first results comparing the relative merits of VCSELs and DFB laser diodes for sensing applications are also shown
Keywords :
III-V semiconductors; aluminium compounds; distributed feedback lasers; gallium arsenide; gas sensors; modulation spectroscopy; oxygen; semiconductor lasers; spectrochemical analysis; surface emitting lasers; 761 nm; DFB laser diodes; GaAs-AlGaAs; O2; VCSELs; harmonic detection; lock-in amplifier time constant; oxygen sensing; single frequency lasers; wavelength modulation spectroscopy;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19960169
