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采用数值方法研究静电场和不同的激光脉冲对氢原子的电离率和高次谐波的影响.结果表明脉冲形状和电离率之间有着确定的关系,电离率反过来又影响了谐波谱的性质;另外,随着所加的静电场强度的增大,电离率呈上升的趋势,而谐波谱出现一个双平台的结构. 相似文献
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The plateau in high-harmonic generation is investigated in the frequency domain. Probability density of an electron in an electromagnetic field is obtained through analysing the quantlzed-field Volkov state. The plateau of hlgh-harmonic generation reflects the spectral density of the electron at the location of nucleus after above-thre shold ionization. 相似文献
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We investigate the ionization and high-order harmonic generation of a hydrogen atom in high-frequency (several atomic units) super strong (up to several tens of atomic units) dichromatic laser fields.An effective iterative method in the framework of high-frequency Floquet theory is used in the calculations.We have considered two kinds of dichromatic laser field,i.e.1ω-2ω and 1ω-3ω.We find that,in both the cases,the ionization and high-order harmonic generation show evident dependence on the relative phase and strength of the additional harmonic field.The dynamical origin of these interference effects is also discussed. 相似文献
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We study a non-stationary electronic wave packet in a quantized electromagnetic field.Generally,the electron and field become entangled as the electronic wave packet evolves.Here we find that,when the initial photon state is a coherent one,the wavefunction of the system can be factorized if we neglect the transferred photon number.In this case,the quantized-field calculation is equivalent to the semi-classical calculation. 相似文献
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