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- W2339257509 abstract "We present mid-infrared laser-induced thermal grating spectroscopy (IR-LITGS) using excitation radiation around 3 µm generated by a simple broadband optical parametric oscillator (OPO). Acetylene as a typical small hydrocarbon molecule is used as an example target species. A mid-infrared broadband OPO pumped by the fundamental output of a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser was used to generate the pump beams, with pulse energies of 6–10 mJ depending on the wavelength. The line width of the OPO idler beam was ∼5 cm −1 , which is large enough to cover up to six adjacent acetylene lines. The probe beam was the radiation of a 532 nm cw solid state laser with 190 mW output power. Signals were generated in atmospheric pressure gas flows of N 2 , air, CO 2 and Ar with small admixtures of C 2 H 2 . A detection limit of less than 300 ppm was found for a point measurement of C 2 H 2 diluted in N 2 . As expected, the oscillation frequency of the IR-LITGS signal was found to have a large dependency on the buffer gas, which allows determination of the speed of sound. Moreover, the results reveal a very strong collisional energy exchange between C 2 H 2 and CO 2 compared to the other gases. This manifests as significant local heating. In summary, the MIR-LITGS technique enables spectroscopy of fundamental vibrational transitions in the infrared via detection in the visible spectral range." @default.
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- W2339257509 date "2016-04-18" @default.
- W2339257509 modified "2023-10-18" @default.
- W2339257509 title "Mid-Infrared Pumped Laser-Induced Thermal Grating Spectroscopy for Detection of Acetylene in the Visible Spectral Range" @default.
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- W2339257509 doi "https://doi.org/10.1177/0003702816641271" @default.
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