The aim of this work was to investigate the possible applications of CARS technology for temperature and concentration measurements in harsh environments (e.g. in combustion and gasification gasification diagnostics) with three different concepts: CARS based on a reliable ps laser system with OPA, CARS based on ps-filamentation and remote CARS based on fs-filamentation. In the first approach, a customized ps-OPA system is pumped by a commercial thin-disk based 1 kHz laser, which provides a pulse duration of 1 ps across the full tuning range 700 - 950 nm. As of our knowledge, for the first time we demonstrated the 1 ps CARS setup with a tunable 1 ps OPA system for three-beam ps-CARS for N2 temperature analysis. In the second approach, significant spectral broadening from ps-filamentation (increase from 24 nm to 280 nm) allowed for CARS measurements of N2, O2 and even CH4. In the third approach, for the first time we demonstrated the single beam fs-filamentation based CARS with air lasing at 391 nm as probe to detect the CARS signals of N2, O2, CO2 and CH4 for remote sensing.
Gas analysis in harsh environments by coherent anti-Stokes Raman scattering
2024
Sonstige
Elektronische Ressource
Englisch
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