Abstract
Two-photon ionisation processes of rare-gas atoms produced by a superposition of multiple high order harmonics are studied by using a photoelectron spectroscopy technique. Second-order nonlinearity is confirmed by comparing the intensity-dependent photoelectron yields between the linear and nonlinear processes, and the cross sections of these processes are estimated. We also demonstrate the autocorrelation measurement of harmonic envelopes as a preliminary step toward characterisation of an attosecond pulse train.
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32.80.Fb; 32.80.Wr; 42.65.-k
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Furusawa, K., Okino, T., Shimizu, T. et al. Photoelectron spectroscopy of two-photon ionisation of rare-gas atoms by multiple high order harmonics. Appl. Phys. B 83, 203–211 (2006). https://doi.org/10.1007/s00340-006-2148-7
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DOI: https://doi.org/10.1007/s00340-006-2148-7