Abstract.
Tunable narrowband mid-infrared radiation from 3.25 to 4.4 μm is generated by a compact fiber-coupled, difference-frequency-based spectrosopic source. A 20-mW external cavity diode laser (with a tuning range from 814 to 870 nm) and a 50-mW distributed-Bragg-reflector diode-laser-seeded ytterbium-doped fiber amplifier operating at 1083 nm are difference-frequency mixed in a multi-grating, temperature-controlled periodically poled LiNbO3 crystal. A conversion efficiency of 0.44 mW/(W2 cm) (corresponding to a power of ≈3 μW at 3.3 μm) represents the highest conversion efficiency reported for a portable device. Performance characteristics of such a sensor and its application to spectroscopic detection of CO2, N2O, H2CO, HCl, NO2, and CH4 will be reported in this work.
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Received: 14 May / Revised version: 24 June 1999 / Published online: 30 September 1999
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Lancaster, D., Richter, D. & Tittel, F. Portable fiber-coupled diode-laser-based sensor for multiple trace gas detection. Appl Phys B 69, 459–465 (1999). https://doi.org/10.1007/s003400050835
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DOI: https://doi.org/10.1007/s003400050835