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• W2807000522 abstract "A mid-infrared cavity-enhanced sensor system was demonstrated for the detection of formaldehyde (H2CO) using a continuous-wave (cw) interband cascade laser (ICL) centered at 3599 nm. A compact Fabry-Perot (F-P) cavity with a physical size of 38 × 52 × 76 mm3 was developed consisting of two concave mirrors with a radius of curvature of 80 mm and a reflectivity of 99.8% at 3.6 μm. Different from the widely reported electro-optical (EO) external modulation based Pound-Drever-Hall (PDH) locking technique, a radio-frequency electrical internal modulation based PDH technique was used for locking the laser mode to the cavity mode. A dual-feedback control on the laser current and on the piezo transducer (PZT) displacement was utilized for further stabilizing mode locking. A 20 m effective optical path length was achieved with a cavity length of 2 cm and a finesse of 1572. The effectiveness and sensitivity of the sensor system were demonstrated by targeting an absorption line at 2778.5 cm-1 for H2CO measurements. A linear relation between the cavity transmitted signal amplitude and the H2CO concentration was obtained within the range of 0-5 ppm. A 1σ detection limit of 25 parts-per-billion (ppb) was achieved with an averaging time of 1 s based on Allan-Werle variance analysis. The reported dual-feedback RF modulation based PDH technique led to a method for gas detection using a similar experimental setup and measurement scheme." @default.
• W2807000522 created "2018-06-13" @default.
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• W2807000522 date "2018-06-04" @default.
• W2807000522 modified "2023-10-15" @default.
• W2807000522 title "Dual-feedback mid-infrared cavity-enhanced absorption spectroscopy for H₂CO detection using a radio-frequency electrically-modulated interband cascade laser" @default.
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• W2807000522 doi "https://doi.org/10.1364/oe.26.015436" @default.
• W2807000522 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30114805" @default.
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