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We theoretically study the high-order harmonic generation (HHG) from a hydrogen atom in an intense few-cycle chirped fundamental laser in combination with an ultraviolet (uv) controlling pulse.The high-order harmonic spectrum is calculated by solving the time-dependent Schr¨odinger equation using the split-operator method.In our calculation,we present the difference of the high-order harmonic spectrum from one-dimensional (1D) model hydrogen atom and three-dimensional (3D) real hydrogen atom.We found that the plateau of the high-order harmonic generation from the 1D case and 3D case are all extended effectively to I p + 35U p due to the presence of the chirped laser pulse and the HHG supercontinuum spectrum is generated by adding an ultraviolet controlling pulse at a proper time,but the efficiency of the HHG for 3D case is more higher at the near cut-off region than the 1D case.Therefore,the generation of the attosecond pulse by synthesizing the harmonics near cut-off region have some slight differences between 1D and 3D simulations.As a real 3D case study,we show that an isolated 18 as pulse with a bandwidth of 232.5 eV is generated directly by optmizing the combination laser fields. 相似文献
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Two-colour coherent control of multiphoton ionization: a comparison between long-range and short-range potential model atoms 下载免费PDF全文
Using the numerical solution of the time-dependent Schr\"odinger
equation of a one-dimensional model atom in a two-colour laser field,
we have investigated the effects of the potential models on coherent
control of atomic multiphoton ionization. It is found that the
photoelectron spectra are obviously different for the long-range
(Coulomb-like) and short-range (with no excited bound states)
potential model atoms, which are produced by two-colour coherent
control of atomic multiphoton ionization in a few laser cycles. Our
results indicate that two-colour coherent control of atomic
multiphoton ionization can be observed in simulations, depending on
the choice of the model potentials. 相似文献