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Calculation of the spatial resolution in two-photon absorption spectroscopy applied to plasma diagnosis

AuthorsGarcía-Lechuga, Mario ; Fuentes, L.M.; Grützmacher, K.; Pérez, C.; Rosa, M. I. de la
Issue Date2014
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 116: 133103 (2014)
Abstract© 2014 AIP Publishing LLC. We report a detailed characterization of the spatial resolution provided by two-photon absorption spectroscopy suited for plasma diagnosis via the 1S-2S transition of atomic hydrogen for optogalvanic detection and laser induced fluorescence (LIF). A precise knowledge of the spatial resolution is crucial for a correct interpretation of measurements, if the plasma parameters to be analysed undergo strong spatial variations. The present study is based on a novel approach which provides a reliable and realistic determination of the spatial resolution. Measured irradiance distribution of laser beam waists in the overlap volume, provided by a high resolution UV camera, are employed to resolve coupled rate equations accounting for two-photon excitation, fluorescence decay and ionization. The resulting three-dimensional yield distributions reveal in detail the spatial resolution for optogalvanic and LIF detection and related saturation due to depletion. Two-photon absorption profiles broader than the Fourier transform-limited laser bandwidth are also incorporated in the calculations. The approach allows an accurate analysis of the spatial resolution present in recent and future measurements.
Identifiersdoi: 10.1063/1.4896497
issn: 1089-7550
Appears in Collections:(CFMAC-IO) Artículos
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