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

Benjamin Scherer; Jürgen Wöllenstein; Matthias Weidemüller; Wenzel Salzmann; Johannes Michael Ostermann; Fernando Rinaldi; Rainer Michalzik

doi:10.1117/12.722031

17 May 2007 Oxygen measurements at high pressures using a low-cost polarisation-stabilized widely tunable vertical-cavity surface-emitting laser

Benjamin Scherer, Jürgen Wöllenstein, Matthias Weidemüller, Wenzel Salzmann, Johannes Michael Ostermann, Fernando Rinaldi, Rainer Michalzik

Author Affiliations +

Proceedings Volume 6589, Smart Sensors, Actuators, and MEMS III; 658908 (2007) https://doi.org/10.1117/12.722031
Event: Microtechnologies for the New Millennium, 2007, Maspalomas, Gran Canaria, Spain

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 b¹Σ^g ₊ -> X³Σ^g ₊ 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.

Citation Download Citation

Benjamin Scherer, Jürgen Wöllenstein, Matthias Weidemüller, Wenzel Salzmann, Johannes Michael Ostermann, Fernando Rinaldi, and Rainer Michalzik "Oxygen measurements at high pressures using a low-cost polarisation-stabilized widely tunable vertical-cavity surface-emitting laser", Proc. SPIE 6589, Smart Sensors, Actuators, and MEMS III, 658908 (17 May 2007); https://doi.org/10.1117/12.722031

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