Modulation of ionization on laser frequency in ultra-short pulse intense laser-gas-target

• 来源期刊: 中国物理（英文版）
• 关键词: intense laser pulse tunnelling ionization partially stripped plasma
• 年，卷（期）: 2006,（10）
• 页码范围: 2357-2362
• 页数: 6页
• 语种: 英文

摘要

Based on the dispersion relation of intense laser pulse propagating in gradually ionized plasma, this paper discusses the frequency modulation induced by ionization of an ultra-short intense laser pulse interacting with a gas target.The relationship between the frequency modulation and the ionization rate, the plasmas frequency variation, and the polarization of atoms (ions) is analysed. The numerical results indicate that, at high frequency, the polarization of atoms (ions) plays a more important role than plasma frequency variation in modulating the laser frequency, and the laser frequency variation is different at different positions of the laser pulse.