Abstract
We demonstrated a mid-IR optical NO2 monitor based on a frequency-stabilized, Yb-fiber laser pumped difference frequency generation (DFG) in a periodically poled lithium niobate (PPLN) crystal. A high power Yb-fiber laser with a fiber Bragg grating (FBG) and a distributed feedback (DFB) laser diode were used as DFG pump and signal sources, respectively. The spectral characteristics of NO2 were evaluated using a multipass absorption cell with an optical path length of 10 m. Continuous absorption spectra of NO2 from 2886.5 cm-1 (3.464 μm) to 2896.5 cm-1 (3.452 μm) were demonstrated over 10 cm-1 with a spectral resolution of approximately 60 MHz. We also demonstrate reproducibility and stability of NO2 detection system with the mid-IR light sources were investigated, in addition to long-term monitoring of NO2 concentrations over a three-day period.
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