Quasi-phase-matching in a dual gas (Ar-H₂) multijet array has recently been demonstrated to be a promising way to enhance the yield of high-order harmonics (HH). Here, we investigate the HH produced individually from these two gases under identical conditions. Our results indicate that the quasi-phase-matching results from the much lower recombination cross section of H₂ as compared to that of Ar in the energy range of interest, rather than from full ionization of H₂ by the driving laser as proposed previously.
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Wang et al. (2012) studied this question.
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