Abstract
A continuous-wave mid-IR diode-laser-based, dual-cavity difference-frequency spectrometer employing silver thiogallate (AgGaS2) as the down-conversion material, and producing only 30 nW of usable mid-IR output, is used to record Doppler spectra of NH3 and SF6 around 10.2 μm and 10.5 μm over the 90-GHz range. The tuning procedure of the spectrometer as well as a baseline noise cancellation technique based on analogue signal ratioing are described. The device can potentially be used for ultra-high-resolution saturation spectroscopy, pending an improvement of the down-conversion efficiency to 1-μW power.
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42.65.Ky; 42.62.Fi; 42.70.Mp; 42.72.Ai; 42.60.Da; 33.20.Ea
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Zondy, JJ., Vedenyapine, V., Kaing, T. et al. Doppler spectroscopy of NH3 and SF6 in the 10-μm range with a tunable AgGaS2 difference-frequency spectrometer. Appl. Phys. B 78, 457–463 (2004). https://doi.org/10.1007/s00340-003-1373-6
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DOI: https://doi.org/10.1007/s00340-003-1373-6