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arXiv 2008.10017physics.opticsphysics.atom-ph
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飞秒laser中太赫兹场诱导的近截止偶次谐波

Terahertz field induced near-cutoff even-order harmonics in femtosecond laser

Bing-Yu Li, Yizhu Zhang, Tian-Min Yan, Y. H. Jiang

摘要:

在强场近似下研究了飞秒激光脉冲在中等强度太赫兹(THz)场中的高次谐波产生,发现截止偶次谐波(NCEH)振幅与THz电场成简单的正比关系.连续波和高斯脉冲的太赫兹诱导的NCEH的形成解析示出。通过对太赫兹场与飞秒脉冲频率比的微扰分析,发现太赫兹光引起的非相干增强效应源于其一阶修正,并阐明了产生这种现象的参数条件。由于宽带THz场时域波形的完整表征对于各种应用至关重要,因此该工作提供了一种替代的时间分辨场检测技术,允许在THz光谱范围内对脉冲进行鲁棒的宽带表征。

英文摘要:

High-order harmonic generation by femtosecond laser pulse in the presence of a moderately strong terahertz (THz) field is studied under the strong field approximation, showing a simple proportionality of near-cutoff even-order harmonic (NCEH) amplitude to the THz electric field. The formation of the THz induced-NCEHs is analytically shown for both continuous wave and Gaussian pulse. The perturbation analysis with regard to the frequency ratio of the THz field to the femtosecond pulse shows the THz-induced NCEHs originates from its first-order correction, and the available parametric conditions for the phenomenon is also clarified. As the complete characterization of the time-domain waveform of broadband THz field is essential for a wide variety of applications, the work provides an alternative time-resolved field-detection technique, allowing for a robust broadband characterization of pulses in THz spectral range.

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