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Radiation properties of high-order harmonic generation(HHG) are calculated for atoms in a strong laser field.The laser-duration dependence and the carrier-envelope-phase(CEP) dependence of HHG radiation properties are presented.The CEP dependence of the pure single distribution pulse of HHG radiation properties shows interesting 180° periodic structures.The quantum enhancement of the laser-assisted photo-ionization by femtosecond(1 fs=10-15 s) and attosecond(1 as=10-18 s) X-ray pulses and the interference patterns of photo-electron energy spectra are theoretically investigated.Transfer equations are presented for pulse reconstructions.The theoretical root-mean-square time(energy) differences of attosecond pulse reconstructions with different durations are less than 2 as(0.8 eV).These methods may be developed as basic techniques to access ultra-fast measurements and molecular movie.
Radiation properties of high-order harmonic generation (HHG) are calculated for atoms in a strong laser field. The laser-duration dependence and the carrier-envelope-phase (CEP) dependence of HHG radiation properties are presented. The CEP dependence of the pure single distribution pulse of HHG radiation properties shows interesting 180 ° periodic structures. The quantum enhancement of the laser-assisted photo-ionization by femtosecond (1 fs = 10-15 s) and attosecond (1 as = 10-18 s) X-ray pulses and the interference patterns of photo-electron energy spectra are theoretically investigated. Transfer equations are presented for pulse reconstructions. The theoretical root-mean-square time (energy) differences of attosecond pulse reconstructions with different durations are less than 2 as (0.8 eV These methods may be developed as basic techniques to access ultra-fast measurements and molecular movie.