Waveform-Controlled Terahertz Radiation from the Air Filament Produced by Few-Cycle Laser Pulses
Waveform-Controlled Terahertz Radiation from the Air Filament Produced by Few-Cycle Laser Pulses
复制标题
少周期激光脉冲产生的空气丝波形控制的太赫兹辐射
DOI：
10.1103/physrevlett.108.255004
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发表时间：
2012-06-20
影响因子：
8.6
通讯作者：
Xu, Zhizhan
中科院分区：
文献类型：
--
作者：
Bai, Ya;Song, Liwei;Xu, Zhizhan
波控太赫兹辐射在太赫兹传感和量子系统相干控制中具有重要的应用价值。提出了一种利用载波包络相位（CEP）稳定的几个周期激光脉冲在大气中传播时产生的空气等离子体产生波形控制的THz辐射的新方案。我们发射了CEP稳定的10 fs长（类似于1.7光周期）的激光脉冲在1.8 μ m到空气中，并发现所产生的太赫兹波形可以通过改变灯丝长度和CEP的驱动激光脉冲控制。计算使用光电流模型，包括传播效应以及再现实验结果，并阐明了各种相移的灯丝的起源。
Waveform-controlled terahertz (THz) radiation is of great importance due to its potential application in THz sensing and coherent control of quantum systems. We demonstrated a novel scheme to generate waveform-controlled THz radiation from air plasma produced when carrier-envelope-phase (CEP) stabilized few-cycle laser pulses undergo filamentation in ambient air. We launched CEP-stabilized 10 fs-long ( similar to 1.7 optical cycles) laser pulses at 1.8 mu m into air and found that the generated THz waveform can be controlled by varying the filament length and the CEP of driving laser pulses. Calculations using the photocurrent model and including the propagation effects well reproduce the experimental results, and the origins of various phase shifts in the filament are elucidated.