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A cavity attenuated phase shift Faraday rotation spectrometer has been developed for oxygen detection near 762 nm. The system incorporates a high-finesse cavity for sensitivity enhancement and achieves minimum detectible polarization rotation of 2×109 rad/√Hz.
A multiheterodyne spectroscopy system based on Fabry-Pérot interband cascade lasers is demonstrated for broadband spectroscopic assessments of gaseous methane. The spectrometer is capable of ∼240 GHz of spectral coverage around 3.21 μm.
We present a fast computational technique based on digital filtering, mixing, and linear resampling to enable high resolution multiheterodyne spectroscopy in any dual-comb system affected by frequency instabilities of the laser sources.