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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 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.
We proposed and theoretically demonstrated an optimized two-color polarization gating method to produce isolated attosecond pulse by using a multicycle infrared laser pulses with the pulse duration up to 60 fs.
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