Femtosecond TALIF for atomic radical detection at high pressure and cell calibration developments
Résumé
Two-photon Absorption Laser Induced Fluorescence (TALIF) enables in situ, high space-and time-resolved measurements of atomic species, such as O, H, N, C, F.
• Conventional ns-TALIF, operating in the quadratic regime, has several limitations
• i) two-photon absorption cross sections are known within ~50% ,
• ii) the quenching rates on which the TALIF signal depends may be difficult to measure in highly collisional plasmas, even with the use of streak cameras , • iii) several non-quadratic phenomena become significant as the laser intensity increases (focused ns, ps, fs laser intensities may reach hundreds of GW/cm² to PW/cm²) • In this work, we follow the path set in [1,2] and present the results of VUV-absorption absolute calibration of the fs-TALIF diagnostic.
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