Abstract
The development and spectroscopic performance evaluation of an ultra-sensitive, mid-IR spectrometer is reported. The laser system is based upon difference-frequency generation (DFG) at ∼3.5 μm by mixing a DFB diode laser at 1562 nm and a DFB fiber laser at 1083 nm using a periodically poled LiNbO3 crystal. DFG radiation was coupled to a 100 m optical path length astigmatic Herriott cell. Sensitive and selective spectroscopic detection of formaldehyde was performed with second-harmonic detection using Peltier-cooled HgCdTe detectors. By applying computer lock-ins, dual-beam optical noise subtraction, focus matching, thermal stabilization, active wavelength control, and advanced signal processing a sensitivity corresponding to an absorbance ∼1.6×10-7 is achieved for 260 s of averaging.
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07.88.+y; 42.62.Fi; 82.80.Gk; 42.60.By; 42.79.Nv
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Weibring, P., Richter, D., Fried, A. et al. Ultra-high-precision mid-IR spectrometer II: system description and spectroscopic performance. Appl. Phys. B 85, 207–218 (2006). https://doi.org/10.1007/s00340-006-2300-4
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DOI: https://doi.org/10.1007/s00340-006-2300-4