Abstract
We describe the application of the vertical-cavity surface-emitting laser (VCSEL) to absorption spectroscopy of the ethylene oxide (EO) Q-branch near 1693 nm. The VCSEL was electrically scanned over spectral intervals of up to ∼13 cm−1 at a 1 kHz repetition rate. A methane absorption line at 5903.3 cm−1 and Fabry–Pérot etalon with a free spectral range of 0.4 cm−1 were used to calibrate frequency scale. The EO was mixed with ambient air, and total gas pressure and mixing ratios were varied from a few mbar to 1 bar and from ∼102 to 105 parts per million, respectively. A rapid roll off of EO absorbance at 5903.7 cm−1 was observed at gas pressures below ∼0.5 bar. A linear dependence of EO peak absorbance on mixing ratio was found at a total gas pressure of 1 bar. We conclude that monolithic VCSELs operating near 1693 nm could be used in EO sensors with a detection limit in the ppb range.
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Lytkine, A., Jäger, W. & Tulip, J. Tunable diode laser spectroscopy of ethylene oxide near 1693 nm. Appl. Phys. B 98, 871–876 (2010). https://doi.org/10.1007/s00340-009-3893-1
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DOI: https://doi.org/10.1007/s00340-009-3893-1