Terahertz emission by balanced nonlinear effects in air plasma

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（12）
• 页码范围: 83-86
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201311.123002

摘要

The evolution of terahertz (THz) waveform in air plasma driven by low-energy few-cycle laser pulses is investigated to improve the accuracy of the carrier envelope phase (CEP) determination.Based on the transient photocurrent model,a balanced spatial distribution of the Kerr and free-electron effects in the plasma is found at 109 μJ input energy.THz inversion occurs only once at the initial CEP of 0.5π,in which high-precision measurement of the CEP of few-cycle laser pulses is achieved.