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提出了利用空气成丝产生的太赫兹波测量少数周期激光的初始载波包络相位(CEP)的方法。空气等离子体产生的太赫兹波形的演变可以用来探测传播中的少数周期激光的载波包络相位的变化。在少数周期强激光场,太赫兹波形反转的数目和反转位置都有规律地依赖于少数周期激光的载波包络相位。利用光电流模型的计算结果表明,在适中的能量范围内,对于所有的初始CEP,太赫兹波形反转点数目是两个或者一个,且在不同输入能量下,总是在初始CEP为0.5π时,太赫兹波形的两个反转点变为一个反转点。这可以提供准确测量驱动激光场初始CEP的方法。
A method of measuring the initial carrier envelope phase (CEP) of a few periodic lasers by using terahertz waves generated by air filament spinning is proposed. The evolution of the terahertz waveforms generated by the air plasma can be used to detect changes in the carrier envelope phase of a few periodic lasers that propagate. In a few cycles of strong laser field, the number and inversion position of terahertz waveforms are regularly dependent on the carrier envelope phase of a few periodic lasers. The calculation results using the photocurrent model show that for all the initial CEPs, the number of tetrhoidal waveform inversion points is two or one at a moderate energy range, and at different input energies, the initial CEP is always 0.5π , The two reversal points of the terahertz waveform become an inversion point. This provides a way to accurately measure the initial CEP driving the laser field.