Abstract.
Measurements of oxygen concentration at high pressures (to 10.9 bar) were made using diode-laser absorption of oxygen A-band transitions near 760 nm. The wide current-tuning frequency range (>30 cm-1) of vertical cavity surface-emitting lasers (VCSELs) was exploited to enable the first scanned-wavelength demonstration of diode-laser absorption at high pressures; this strategy is more robust than fixed-wavelength strategies, particularly in hostile environments. The wide tuning range and rapid frequency response of the current tuning were further exploited to demonstrate wavelength-modulation absorption spectroscopy in a high-pressure environment. The minimum detectable absorbance demonstrated, ∼1×10-4, corresponds to ∼800 ppm-m oxygen detectivity at room temperature and is limited by etalon noise. The rapid- and wide-frequency tunability of VCSELs should significantly expand the application domain of absorption-based sensors limited in the past by the small current-tuning frequency range (typically <2 cm-1) of conventional edge-emitting diode lasers.
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Received: 26 July 2000 / Revised version: 2 January 2001 / Published online: 20 April 2001
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Wang, J., Sanders, S., Jeffries, J. et al. Oxygen measurements at high pressures with vertical cavity surface-emitting lasers . Appl Phys B 72, 865–872 (2001). https://doi.org/10.1007/s003400100539
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DOI: https://doi.org/10.1007/s003400100539