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Proceedings Paper

Oxygen measurements at high pressures using a low-cost polarisation-stabilized widely tunable vertical-cavity surface-emitting laser
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Paper Abstract

Vertical-cavity surface-emitting lasers (VCSELs) are used for oxygen monitoring via tunable diode laser spectroscopy at 760nm wavelength. For the desired application, novel polarization-stable laser diodes based on AlGaAs were developed. We present measurements of the pressure-broadening coefficients of the electric dipole forbidden oxygen A-Band b1Σg + -> X3Σg + transition at 760nm. For the first time the pressure-broadening coefficients were determined with a temperature tuned vertical-cavity surface-emitting laser. Because of special techniques of polarization stabilization with a combination of a dielectric surface grating and a surface relief the VCSELs have a mode hop-free tuning range of more than 7nm and a sidemode suppression of more than 30dB. This provides a low cost laser diode system with a wide tuning range, which enables the possibility of simultaneous measurement of temperature, pressure and oxygen concentration in air, high pressure measurements and also a higher accuracy of oxygen concentration measurements due to averaging over 18 absorption lines.

Paper Details

Date Published: 17 May 2007
PDF: 10 pages
Proc. SPIE 6589, Smart Sensors, Actuators, and MEMS III, 658908 (17 May 2007); doi: 10.1117/12.722031
Show Author Affiliations
Benjamin Scherer, Fraunhofer Institute for Physical Measurement Techniques (Germany)
Jürgen Wöllenstein, Fraunhofer Institute for Physical Measurement Techniques (Germany)
Matthias Weidemüller, Albert-Ludwigs-Univ. (Germany)
Wenzel Salzmann, Albert-Ludwigs-Univ. (Germany)
Johannes Michael Ostermann, Univ. Ulm (Germany)
Fernando Rinaldi, Univ. Ulm (Germany)
Rainer Michalzik, Univ. Ulm (Germany)

Published in SPIE Proceedings Vol. 6589:
Smart Sensors, Actuators, and MEMS III
Thomas Becker; Carles Cané; N. Scott Barker, Editor(s)

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