Laser diode based oxygen sensing: A comparison of VCSEL and DFB laser diodes emitting in the 762 nm region

The performance of VCSEL and DFB laser diodes for spectroscopic based high sensitivity oxygen sensing is compared. Detectivities of < 20 ppm m using the DFB laser diode and < 7 × 10 3 ppm m using the VCSEL were determined utilising wavelength modulation spectroscopy and harmonic detection. We...

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Bibliographic Details
Published in:Infrared physics & technology 1997-10, Vol.38 (6), p.325-329
Main Authors: Weldon, V., O'Gorman, J., Pérez-Camacho, J.J., McDonald, D., Hegarty, J., Connolly, J.C., Morris, N.A., Martinelli, R.U., Abeles, J.H.
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Biological and medical applications
DFB laser diodes
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Lasers
Metrological applications
Optics
Oxygen
Physics
Semiconductor lasers
laser diodes
Sensing
VCSEL
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Summary:The performance of VCSEL and DFB laser diodes for spectroscopic based high sensitivity oxygen sensing is compared. Detectivities of < 20 ppm m using the DFB laser diode and < 7 × 10 3 ppm m using the VCSEL were determined utilising wavelength modulation spectroscopy and harmonic detection. We assess factors influencing the relative performance of these devices, including spectral resolution, laser optical power and light current curve linearity.
ISSN:1350-4495
1879-0275
DOI:10.1016/S1350-4495(97)00024-8