Detection of broadband terahertz waves with a laser-induced plasma in gases
Detection of broadband terahertz waves with a laser-induced plasma in gases
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DOI：
10.1103/physrevlett.97.103903
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发表时间：
2006-09-08
影响因子：
8.6
通讯作者：
Zhang, X. -C.
中科院分区：
文献类型：
--
作者：
Dai, Jianming;Xie, Xu;Zhang, X. -C.
报道了利用超短脉冲激光诱导空气等离子体产生的电场诱导二次谐波实现太赫兹波宽带探测的实验结果和理论分析。通过引入激光诱导等离子体中白色光的二次谐波分量作为本振子，首次实现了宽带太赫兹波与环境空气的相干探测。我们的研究结果表明，根据探测强度，太赫兹波在空气中的检测可以分为非相干，混合，相干检测。只有当隧道电离过程在气体中占主导地位时，才能实现相干检测。
We report the experimental results and theoretical analysis of broadband detection of terahertz (THz) waves via electric-field-induced second-harmonic generation in laser-induced air plasma with ultrashort laser pulses. By introducing the second-harmonic component of the white light in the laser-induced plasma as a local oscillator, coherent detection of broadband THz waves with ambient air is demonstrated for the first time. Our results show that, depending on the probe intensity, detection of THz waves in air can be categorized as incoherent, hybrid, and coherent detection. Coherent detection is achieved only when the tunnel ionization process dominates in gases.