High harmonic generation has been investigated in the atomic gases Ar and Xe as well as in the diatomic molecular gases H 2 , D 2 , N 2 and O 2 using a linearly polarized picosecond dye laser (594 nm) and a linearly polarized subpicosecond Ti:sapphire/Nd:glass laser (1053 nm). The harmonic conversion efficiencies are compared by choosing different gas pairs as a function of three parameters: (1) field-free ionization potential (2) mass and (3) static average polarizability. It is shown that the ionization potential and mass are not sensitive parameters for harmonic efficiency, but the polarizability is an important factor.
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Liang et al. (1994) studied this question.
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