Two-Colour Effect on the Ionization and Harmonic Generation ofOne-Dimensional He+

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2001,（8）
• 页码范围: 1047-1049
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

Using the one-dimensional ion mode, we theoretically investigate the dynamics ionization process and the highorder harmonic generation of the He+ subject to different kinds of two-colour laser pulses with the same fundamental frequency but various harmonic frequencies. It is found that from the results calculated by numerically solving the time-dependent Schrodinger equation, the two-colour laser pulse with the fundamental and harmonic frequencies enables the power spectrum of high-order harmonic generation to increase by a few orders of magnitude and the yield of He2+ to enhance significantly when the harmonic frequency of the laser pulse is close to the energy interval between the ground state and the first excited state of He+; even the harmonic field added into the pulse is much weaker than the fundamental one.