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For the future progress of nonlinear attosecond science, one of the most important issues is the development of high-energy isolated attosecond pulse sources. In this paper, we review our research on the energy-scaling method for isolated attosecond pulse generation, which combines infrared two-color gating and an energy-scaling method of high-order harmonic generation. By establishing the robust...
To make a breakthrough for attosecond science, one of the most important issues is the development of high-power isolated attosecond pulses (IAPs) and/or attosecond pulse trains (APTs). At present high-power APTs have been successfully generated thanks to research on harmonic energy scaling using a loosely focusing geometry [1]. Although IAP were already obtained using a state-of-the-art Ti:sapphire...
We found a significant difference between the interferometric fringes on the intensity-autocorrelation and those on anisotropy-autocorrelation of an atttosecond pulse train. This result can discriminate multiple two-photon processes ionizing a nitrogen molecule.
We investigated multiple ionization process in atoms and molecules by an intense isolated attosecond pulse. Observed Ne2+ signal guarantees that our IAP sources are strong enough to create the nonlinear phenomena.
We proposed a new gating scheme, called infrared double optical gating for producing isolated attosecond pulses. It was shown that CEP stabilization is not required even though a multicycle driving pulse is used.
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