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

Abstract

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.

Authors:
 [1];  [2];  [3]; ; ;  [1]
  1. Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, 47011-Valladolid (Spain)
  2. (Spain)
  3. Departamento de Física Aplicada, Universidad de Valladolid, 47011-Valladolid (Spain)
Publication Date:
OSTI Identifier:
22305737
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ABSORPTION SPECTROSCOPY; ACCOUNTING; CAMERAS; DECAY; DETECTION; DISTRIBUTION; ENERGY-LEVEL TRANSITIONS; EXCITATION; FLUORESCENCE; FOURIER TRANSFORMATION; HYDROGEN; LASER RADIATION; PHOTONS; PLASMA DIAGNOSTICS; RADIANT FLUX DENSITY; SATURATION; SPATIAL RESOLUTION; THREE-DIMENSIONAL CALCULATIONS

Citation Formats

Garcia-Lechuga, M., Laser Processing Group, Instituto de Óptica “Daza de Valdés,” CSIC, 28006-Madrid, Fuentes, L. M., Grützmacher, K., Pérez, C., E-mail: concha@opt.uva.es, and Rosa, M. I. de la. Calculation of the spatial resolution in two-photon absorption spectroscopy applied to plasma diagnosis. United States: N. p., 2014. Web. doi:10.1063/1.4896497.
Garcia-Lechuga, M., Laser Processing Group, Instituto de Óptica “Daza de Valdés,” CSIC, 28006-Madrid, Fuentes, L. M., Grützmacher, K., Pérez, C., E-mail: concha@opt.uva.es, & Rosa, M. I. de la. Calculation of the spatial resolution in two-photon absorption spectroscopy applied to plasma diagnosis. United States. doi:10.1063/1.4896497.
Garcia-Lechuga, M., Laser Processing Group, Instituto de Óptica “Daza de Valdés,” CSIC, 28006-Madrid, Fuentes, L. M., Grützmacher, K., Pérez, C., E-mail: concha@opt.uva.es, and Rosa, M. I. de la. Tue . "Calculation of the spatial resolution in two-photon absorption spectroscopy applied to plasma diagnosis". United States. doi:10.1063/1.4896497.
@article{osti_22305737,
title = {Calculation of the spatial resolution in two-photon absorption spectroscopy applied to plasma diagnosis},
author = {Garcia-Lechuga, M. and Laser Processing Group, Instituto de Óptica “Daza de Valdés,” CSIC, 28006-Madrid and Fuentes, L. M. and Grützmacher, K. and Pérez, C., E-mail: concha@opt.uva.es and Rosa, M. I. de la},
abstractNote = {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.},
doi = {10.1063/1.4896497},
journal = {Journal of Applied Physics},
number = 13,
volume = 116,
place = {United States},
year = {Tue Oct 07 00:00:00 EDT 2014},
month = {Tue Oct 07 00:00:00 EDT 2014}
}