Abstract
We report the first experimental measurement and theoretical estimation of seventh χ (7)eff and ninth χ (9)eff order effective nonlinear susceptibilities. The correlation of ninth, seventh and fifth harmonic signal efficiencies in various phase-matched mixtures of Ar (or Xe) and sodium atoms, is experimentally investigated. Using direct and cascade processes of harmonic generation, the modulus ratio is measured for the higher nonlinearities, which allows an estimation of χ (7)eff and χ (9)eff from the lower order optical susceptibilities. Results from numerical calculations of atomic nonlinear susceptibilities up to the ninth order, accounting for the discrete spectrum and the continuum, are presented.
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Mitev, V.M., Pavlov, L.I. & Stamenov, K.V. Seventh and ninth order nonlinear susceptibility measurement in alkali metal vapour. Opt Quant Electron 11, 229–236 (1979). https://doi.org/10.1007/BF00620109
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DOI: https://doi.org/10.1007/BF00620109